Topic 8 Formative Assessment

Which number sentence demonstrates the Commutative Property of Addition?

• 12 + 5 = 9 + 8

• 14 + 0 = 14

• 2 + (5 + 7) = (2 + 5) + 7

• 6 + 8 = 8 + 6

What is the missing number?

(___ + 4) + 9 = 3 + (4 + 9)

• 9

• 2

• 3

• 4

Use mental math and place value to find the sum of 15 + 13 + 31.

Look at the shaded cells in the addition table.

Which pattern and property is shown in the shaded cells?

• Each green sum is 3 greater than one of its addends; the Commutative Property of Addition.

• Each green sum is equal to zero plus the other addend; the Identity Property of Addition.

• Each green sum is one greater than the sum before; the Associative Property of Addition.

• There are no patterns or properties.

Look at the sums that are shaded in the addition table. Which of the following explains why the sums in each shaded diagonal line are the same?

• The order of the addends change. Changing the order of the addends does not change the sum.

• The addends are equal. Doubles facts always have an even sum.

• Each addend increases by 2, so the sums are the same.

• One addend increases by 1 and the other addend decreases by 1, so the sums are the same.

What is one way you could find the sum of 32 + 55 using mental math?

• 20 + 50 and 10 + 5

• 30 + 50 and 2 + 5

• 30 + 40 and 2 + 10

• 30 + 50 and 2 + 10

Kamila earns $4 each hour that she babysits. She starts with $192. Today she babysits for 5 hours. How much money does she have at the end of the day? What steps can you take to find the answer? Select all that apply.

• Add $4 to $192 to find out how much money Karin has in all.

• Multiply $4 by 5 to find out how much Karin earns babysitting today.

• Add $192 and $20 to find out how much money Karin has at the end of the day.

• Divide $192 by $4 to find out how many hours Karin babysat.

The table shows the number of pancakes sold at a fundraiser on Saturday and Sunday. How can you break apart the addends to find the total number of pancakes sold on both days?

• (400 + 200) +

  (10 + 30) + (5 + 2)

• 400 + 10 + 5

• (5 + 2) + (41 + 23)

• (230 + 410) + (15 + 2)

To subtract 60 – 24 mentally, Mark subtracted 60 – 20 = 40 first.

What should he do next?

• Subtract 60 – 4.

• Subtract 40 – 4.

• Add 20 + 4.

• Add 40 + 4.

A train left the terminal with 78 passengers. At the first stop, 42 passengers got off the train, and no passengers got on the train. How many passengers were left on the train? Use mental math to solve.