Class Quilt Math: Using Properties to Multiply
0 / 12Class Quilt Math: Using Properties to Multiply
Change the order, regroup factors, and break apart facts while sewing a class quilt.
Turn it around
Changing the order of the factors does not change the product. Fill in the blanks or choose the best answer.
1.
Ms. Ortiz's class sews a quilt with 4 rows of 7 patches. Jada turns the quilt on its side. Now it has 7 rows.
4 × 7 = 7 ×
Both ways, the quilt has patches.
2.
Leo knows that 6 × 8 = 48. Which other fact does he also know?
3.
Fill in the missing factor and the product.
9 × 3 = 3 × =
Group the factors
You can group three factors in different ways. The product stays the same.
4.
Diego sews 3 quilt blocks. Each block has 2 rows of 5 patches. Find the total number of patches two ways.
(3 × 2) × 5 = × 5 =
3 × (2 × 5) = 3 × =
5.
Ana wants to find 2 × 7 × 5. She wants to make a 10 first. Which shows her first step?
6.
Ryan finds 4 × 2 × 3 by multiplying 2 × 3 first.
4 × (2 × 3) = 4 × =
7.
Match each expression to the one with the same product.
Break it apart
Break a hard fact into two easier facts. Then add the products.
8.
Kofi's part of the quilt has 7 rows of 8 patches. He splits the 7 rows into 5 rows and 2 rows.
7 × 8 = (5 × 8) + (2 × 8)
= +
= patches
9.
Break apart 6 × 9 by splitting the 9 into 5 and another number.
6 × 9 = (6 × 5) + (6 × )
= 30 +
=
10.
Which shows a correct way to break apart 4 × 9?
11.
Is each expression equal to 6 × 7? Sort them.
12.
Mia does not know 8 × 7 yet. Explain how she can break it apart into facts she knows to find the product.