Topics 8 & 9

​ ​ Match the equations with the correct property of addition.

• (2 + 3) + 4 =

  (4 + 2) +3

• Associative (Grouping) Property
• 18 + 0 = 18

• Commutative Property
• (1 + 17) + 2 =

  1 + (17 + 2)

• Associative (Grouping) Property

• 22 + (35 + 17) = (22 + 35) + 17

• Commutative Property

• 17 + 6 + 11 =

  6 + 11 + 17

• Identity (Zero) Property

Round to the nearest tens place.

738

Round to the nearest tens place.

291

Round to the nearest tens place.

21

Round to the nearest hundreds place.

163

Round to the nearest hundreds place.

852

Round to the nearest hundreds place.

439

Round to the nearest tens place, then find the sum.

221 + 78

Round to the nearest tens place then find the sum.

19 + 24

Round to the nearest hundreds place then subtract to find the difference.

513 - 257