Transcript guess handbag

3rd Grade
Math
Study Guide
Oct bench – Nov bench
Student Version
Know when to Re-group
and Compute!
Circle the place values where you would
regroup in each problem. Why are you
regrouping? Compute each problem.
343
- 169
276
+ 112
276
- 162
262
+ 168
306
- 163
Sample Problem
Estimation to find
solutions
Exact
Team
Jessica drove 246 miles on
Friday. Then she drove 112
miles on Saturday. What is
the best estimate in the
number of miles Jessica
drove? (round to nearest 10)
Why?
Explain how you know your estimate is a reasonable estimate?
Estimate
Team
Sample Problem
Using Compatible
Numbers to Estimate
Solutions
Compatible numbers are “
“ numbers.
When finding the sum, they are numbers that make ______.
46
+32
When finding the difference, they are numbers that make ____
Or ____.
53
- 25
Sample Problem
Write the appropriate letter next to the
correct vocabulary word.
A.
b. toys
4
y. toys
4
4
?
B.
b. toys
4
y. toys
?
Sample Problems
Personal Connections
•Multiply the number of sides
on a triangle by 4.
•Then take the product and
find 8 fewer.
• Take the difference and
increase it by the number of
wheels on a truck.
What’s the number?
Sample Problems
Personal Connections
Mult. facts through 12
arrays
How many arrays can you draw for the product
of 12? ___________
Draw and label the arrays below.
Sample Problem
Apply multiplication
facts using models.
Circle the groups. How many groups did you circle?
How many erasers are in 1 group?
Write the number sentence that shows you how to find the total
number of erasers.
Sample Problem
Fact Family - Fill in the houses with
the facts that go with the numbers
and symbols.
20
42
X÷
X÷
5
4
?
6
42 ÷ 6 =
Write a number sentence
that does NOT belong.
Sample Problem
Look at
the model
drawing.
Finish step
3 and 4.
?
Total
B. candy
# in
Each
Groups
4
4
Bag1
Bag 2
4
Bag 3
4
Bag 4
4
Bag5
Sample Problems
Multi-step
Brandy bought 5 bags of candy to share with her sister. Each of
the bags had 4 pieces of candy. When she got home, she and her
sister ate 7 pieces of candy. How much candy remained?
• Complete the model drawing. Complete steps 3 and 4 as well.
?
Total
# candy left
B. candy
# in
Each
Groups
4
Bag1
4
4
Bag 2 Bag 3
4
4
Bag 4
Bag5
Sample Problem
Complete
Steps 3
and 4.
20
Total
B. candy
?
# in
Each
Bag1
Bag 2
Bag 3
Bag 4
Bag5
Groups
20
Total
B. candy
# in
Each
4
4
Bag 1
Bag 2
………….
4
Bag
Groups
Look at the models and number sentences in problems 1 and 2 from above.
• What are some similarities?
• What are some differences?
?
Multiplication vs. Division
•Write a number sentence that matches the picture.
24
Cody
minutes
4
Day
1
Cody
minutes
4
4
Day Day
2
3
4
4
Day Day Day
4
5
?
4
4
4
?
4
Day
1
Cody
minutes
4
4
4
Day Day
2
3
Day Day Day
4
5
6
24
?
Day
1
Day Day
2
3
Day Day Day
4
5
How do you know the difference between multiplication and
division by looking at the model drawings?
6
Sample Problems
Sample Problem