Transcript Ten Minute Math

Warm Up
1.
The area of Kyle’s shop is 72 square
meters. Which one of the following
dimensions could Kyle’s shop be?
a.
30 meters long and 42 meters wide
b.
3. Which table shows 4 more than 5 times
the number in Set A?
A. Set A
Set B
B.
Set A
Set B
1
9
1
9
9 meters long and 8 meters wide
3
19
3
11
c.
52 meters long and 20 meters wide
6
34
6
14
d.
7 meters long and 8 meters wide
2. How many centimeters are equal to 6
meters? (Use your mathematics chart)
4. Ashley wrote down the number of
people on her basketball team. Then she
multiplied the number by 2 and
subtracted 6 from the product. The result
was 8. What was the number of people on
Ashley’s basketball team?
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5. Write and solve a number sentence
that could be used to find the regular
price of a stereo and a refrigerator.
Multiplication Assessment
• 10-12 Assessment (Check & Grade)
• Assessment: Multiplication Combinations
How can we use patterns to multiple by
multiples of 10?
Here’s a problem for you to solve before we talk about it
together. Think about the work you’ve been doing on multiplying
by 10s. How can that help you with this problem?
15 x 13=
How can we use patterns to multiple by
multiples of 10?
Practice with your group to solve the following problems by
breaking apart.
1. 23 x 12=
3. 42 x 36=
2. 18 x 45=
2. 54 x 62=
How can we use patterns to multiple by
multiples of 10 and 100?
Additional Practice If Needed
Show: Video 7-4 on EnVision “Visual Learning Animations” CD
Multiplying 2-Digit Numbers by Multiples of Ten
90
270
How can you use a grid to find the product 23 x 90?
Could we split one of the factors?
Which factor should we split to make the problem
easier???
Why would splitting 23 make the problem easier?
It would make our problem easier, because 90 is
already a multiple of 10 and now we also have 20
which is a multiple of 10.
Work with your shoulder partner to find the two
partial products.
20 x 90 = 1,800 and 90 x 3 = 270
Add partial products together: 1,800 + 270 = 2, 070
1,800
Problem: In January, Tim’s aquarium had 23 guppies. A year later, he
had 90 times as many guppies. How many guppies does Tim have
now? Find a shortcut to solve the problem.
20 23 3
Guided Practice
Work with your shoulder partner to solve the above problems.
Then, discuss your results with the class.
Multiplying 2-Digit Numbers by Multiples of
Ten
Math Workshop
• Story Problems About 10
• Things That Come In Groups
• Multiplying Groups of 10
Math Menu
• Play Missing Factor
• Multiplication Migration