1.1 Properties

In a flea circus, 12 fleas pull carts, 23 fleas ride on tiny bicycles, and 18 fleas sit on seesaws. You can add 12 + 23 + 18 to find the total number of fleas. Which equation shows the Commutative Property of Addition?

• 12 + 23 + 18 = 23 + 12 + 18

• 12 + 23 + 18 = (12 + 23) + 18

• 12 + 23 + 18 = 12 + (23 + 18)

• 12 + 23 + 18 = 35 + 18

Complete the equation.

15 + (25 + 27) = (15 + _____) + 27

• 40

• 25

• 10

• 52

Nick read 24 pages in his book one day, 29 pages the next day, and 16 pages on the third day. Megan read 26 pages for three days in a row.

Who read more pages?

How many more?

• Megan read 9 more pages.

• Megan read 11 more pages.

• Nick read 9 more pages.

• Megan read 11 more pages.

Canoes rent for $29 per day. Which expression can be used to find the cost in dollars of renting 6 canoes for a day?

• (6 + 20) + (6 + 9)

• (6 × 20) + (6 × 9)

• (6 + 20) × (6 + 9)

• (6 × 20) × (6 × 9)

103 + 21 = ____+ 103

Complete the equation and identify the property used.

• 21; Commutative Property

• 21; Associative Property

16 + (70 + 8) = (16 + ____ )+ 8

Complete the equation and identify the property used.

• 70; Commutative Property

• 70; Associative Property

4 × 47

Find the product.

3 × 40 × 6

Find the product.

34 + 21 + 84 + 7

Find the sum.

Maggie’s class bought three books at the book fair. The books cost $15, $9, and $12.

Apply properties to find how much the class spent in all.