Add and Subtract Decimals with Models

Which expression is represented in the model?

• 0.32 - 0.17

• 0.49 - 0.32

• 0.32 + 0.17

• 0.49 - 0.17

What equation matches this model?

• 0.7 - 0.44 = 1.14 
• 1.14 - 0.44 = 0.7
• 1.14 + 0.7 = 0.44
• 0.7 + 0.44 = 1.14

What is the difference?

• 0.19

• 0.61

• 0.42

• 0.2

Which expression is being represented in this model?

• 48 - 25

• 0.48 - 0.52

• 0.48 - 0.25

• 0.23 + 0.25

Jay and Anna weighed their Halloween candy. Jay had 3.45 lbs of candy. Anna had 2.91 lbs of candy. How many pounds of candy did they have together?

• 6.36

• 5.136

• 5.36

• 6.45

Ms. Loredo bought some snacks for for the field trip on Monday. She bought 45.13 oz. bags of chips and 56.9 oz. box cookies. How many ounces of snacks did Ms. Loredo buy?

• 50.82

• 508.2

• 102.03

• 101.103

Brett was downloading two apps onto his iPad. One app was 7.32gb and the other was 8.71gb. How many more gb was the second than the first app?

• 1.71gb

• 16.03gb

• 1.39 gb

• 1.41gb

Solve: 34.6 -1.99

Only type the answer. No words!

What was the first mistake in this solution?

• The numbers are not lined up correctly.

• The students did not add the decimal or place holders.

• The student did not regroup.

• There is no error, it is correct.

What was the first mistake in this solution?

• The numbers are not lined up correctly.

• The students did not use place holders.

• The student did not regroup.

• Students did not bring down the decimal.