Transcript Fact Family
Name ___________________________ Learning Objective Today, we will write addition and subtraction fact families. CFU What are we going to do today? Activate (or provide) Prior Knowledge Find the sum. Find the difference. The sum is the answer after you add. The difference is the answer after you subtract. 5 A. 2 + 3 = ___ C. 3 5 – 2 = ___ 5 B. 3 + 2 = ___ D. 2 5 – 3 = ___ What three numbers are used in these facts? 2, 3, 5 CFU Teacher completes problems A and C. Students answer problems B and D. Students, the numbers 2, 3, and 5 are used in the above number facts. The only difference is that A and B are addition and C and D are subtraction. Today, we will learn that when addition and subtraction facts use the same three numbers, we call them a fact family. DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Concept Development A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Fact Family Addition Facts Subtraction Facts • Start with an addition fact. • Reverse1 it to get the second addition fact. 1 • Start with the sum of the addition facts.. • Subtract each number. 2 + 3 = 5 5 – 2 = 3 3 + 2 = 5 5 – 3 = 2 opposite order CFU Are these two number sentences part of a fact family? YES NO 2 + 1 = 3 1 + 2 = 3 How do you know? In your own words, what is a fact family? A fact family is a group of _____________________. DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Skill Development/Guided Practice A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Write addition and subtraction fact families. The sum is the answer after you add. The difference is the answer after you subtract. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. 1. 2. 3. _______ 2 + ________ 1 = _________ 3 _______ = _________ 1 3 – ________ 2 3 2 = _________ _______ 1 + ________ 1 _______ = _________ 2 3 – ________ _______ 3 + ________ 1 = _________ 4 _______ = _________ 1 4 – ________ 3 4 3 = _________ _______ 1 + ________ _______ = _________ 3 4 – ________ 1 _______ 2 + ________ 4 = _________ 6 _______ = _________ 4 6 – ________ 2 6 2 = _________ _______ 4 + ________ _______ = _________ 2 6 – ________ 4 CFU How did I write the related addition fact? What number did I start with to write the subtraction fact? How did you write the related addition fact? What number did you start with to write the subtraction fact? DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Importance A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. 1. Writing fact families will help you memorize2 math facts. 2 remember Fact Family Addition Facts Subtraction Facts 2 + 4 = 6 4 + 2 = 6 6 – 2 = 4 6 – 4 = 2 2. Writing fact families will help you check your answers. 4 + 2 = 6 My answer is 6. 6 – 2 = 4 I can check my answer using a related subtraction fact. CFU Does anyone else have another reason why it is important to write addition and subtraction fact families? (pair-share) Why is it important to write addition and subtraction fact families? You may give me one of my reasons or one of your own. Which reason is more important to you? Why? DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Closure 1. Write one fact that will be in the same family as given fact. 4 + 1 = 5 3 + 4 = 7 Answer may vary 2. Identify fact families of addition and subtraction below. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. _______ 1 + ________ 4 = _________ 5 _______ 5 – ________ 4 1 = _________ 5 1 = _________ _______ 4 + ________ _______ 1 5 – ________ 4 = _________ 3. What did you learn today about writing addition and subtraction fact families? (pair-share) DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Independent Practice Name ___________________________ A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Write addition and subtraction fact families. The sum is the answer after you add. The difference is the answer after you subtract. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. 1. 2. 3. _______ 5 + ________ 1 = _________ 6 _______ 5 = _________ 1 6 – ________ 5 = _________ _______ 1 + ________ 6 _______ = _________ 5 6 – ________ 1 _______ 3 + ________ 2 = _________ 5 _______ = _________ 2 5 – ________ 3 3 = _________ _______ 2 + ________ 5 _______ = _________ 3 5 – ________ 2 _______ 3 + ________ 4 = _________ 7 _______ = _________ 4 7 – ________ 3 3 = _________ _______ 4 + ________ 7 _______ = _________ 3 7 – ________ 4 DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Periodic Review 1 Name ___________________________ A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Write addition and subtraction fact families. The sum is the answer after you add. The difference is the answer after you subtract. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. 1. 2. 3. _______ 6 + ________ 1 = _________ 7 _______ 7 – ________ 6 = _________ 1 7 6 = _________ _______ 1 + ________ _______ 6 7 – ________ 1 = _________ _______ 5 + ________ 3 = _________ 8 _______ = _________ 3 8 – ________ 5 8 5 = _________ _______ 3 + ________ _______ = _________ 5 8 – ________ 3 _______ 2 + ________ 5 = _________ 7 _______ 7 – ________ 2 = _________ 5 7 2 = _________ _______ 5 + ________ _______ = _________ 2 7 – ________ 5 DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Periodic Review 2 Name ___________________________ A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Write addition and subtraction fact families. The sum is the answer after you add. The difference is the answer after you subtract. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. 1. 2. 3. _______ 2 + ________ 6 = _________ 8 _______ = _________ 8 – ________ 2 6 8 2 = _________ _______ 6 + ________ _______ 2 8 – ________ 6 = _________ _______ 5 + ________ 4 = _________ 9 _______ = _________ 4 9 – ________ 5 9 5 = _________ _______ 4 + ________ _______ = _________ 5 9 – ________ 4 _______ 7 + ________ 1 = _________ 8 _______ = _________ 1 8 – ________ 7 8 7 = _________ _______ 1 + ________ _______ = _________ 7 8 – ________ 1 DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Periodic Review 3 Name ___________________________ A fact family is a group of related addition and subtraction facts. • Fact families use the same three numbers. Write addition and subtraction fact families. The sum is the answer after you add. The difference is the answer after you subtract. Step #1: Read the addition fact. Step #2: Write the related addition fact. Hint: Reverse the order of the first addition fact. Step #3: Write the two related subtraction facts. Hint: Start with the sum. Step #4: Read all the facts in the fact family. 1. 2. 3. _______ 2 + ________ 7 = _________ 9 _______ = _________ 9 – ________ 2 7 9 2 = _________ _______ 7 + ________ _______ 9 – ________ 7 = _________ 2 _______ 6 + ________ 4 = _________ 10 _______ = _________ 10 – ________ 6 4 6 = _________ _______ 4 + ________ 10 _______ 6 10 – ________ 4 = _________ _______ 8 + ________ 2 = _________ 10 _______ = _________ 10 – ________ 8 2 8 = _________ _______ 2 + ________ 10 _______ 10 – ________ 2 = _________ 8 DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only. Blank Page DataWORKS Educational Research (800) 495-1550 • www.dataworks-ed.com ©2011 All rights reserved. Comments? [email protected] 1st Grade Number Sense 2.2 Use the inverse relationship between addition and subtraction to solve problems. Lesson to be used by EDI-trained teachers only.