Copy of Chapter 1

Student's Name

Choose the sum. Then use the Commutative Property of Addition to choose the related addition sentence.

• 5 + 8 = 13; 8 + 5 = 13
• 5 + 8 = 13; 13 - 5 = 8
• 5 + 8 = 13; 5 + 8 = 13
• 5 + 8 = 13; 13 - 8 = 5

Choose the sum. Then use the Commutative Property of Addition to choose the related addition sentence.

• 6 + 4 = 10; 6 + 4 = 10
• 6 + 4 = 10; 10 - 4 = 6
• 6 + 4 = 10; 4 + 6 = 10
• 6 + 4 = 10; 10 - 6 = 4

Choose the sum. Then use the Commutative Property of Addition to choose the related addition sentence.

• 10 + 2 = 12; 12 - 10 = 2
• 10 + 2 = 12; 12 - 2 = 10
• 10 + 2 = 12; 2 + 10 = 12
• 10 + 2 = 12; 10 + 2 = 12

Round to the nearest ten.

Round to the nearest ten.

Round to the nearest hundred.

Round to the nearest hundred.

Choose the best way to estimate the sum.

• 25 + 50 = 75
• 20 + 50 = 70
• 20 + 40 = 60
• 21 + 47 = 68

Choose the best way to estimate the sum.

• 400 + 200 = 600
• 300 + 200 = 500
• 300 + 300 = 600
• 350 + 220 = 570