Estimating and Modeling Decimal Addition and Subtraction

What is the best estimate for 12.98 + 7.3

• 19

• 21

• 20

• 20.28

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Kathy estimates that 25.7 - 10.59 is about 15. Is that an overestimate, or an underestimate?

• Overestimate

• Underestimate

Tags

CCSS.5.NBT.A.3

CCSS.5.NBT.B.7

Does the problem show addition or subtraction?

• Addition

• Subtraction

Tags

CCSS.5.NBT.B.7

Does the problem show addition or subtraction?

• Addition

• Subtraction

Tags

CCSS.5.NBT.B.7

What does this model represent?

• 57

• 0.057

• 0.507

• 0.57

Tags

CCSS.4.NF.C.6

How do we know that this model must be a decimal?

• There are no wholes, only part of a whole.

• We're learning about decimals.

• It is on a thousandths grid.

• You told me in the question.

Tags

CCSS.6.NS.C.6C

What is the correct addition sentence to represent this model?

• 0.8 + 0.3

• 0.8 + 0.03

• 0.01 + 0.73

• 0.1 + 0.73

Tags

CCSS.5.NBT.B.7

What is the sum of this addition problem?

• 0.83

• 83

• 0.083

• 1.83

Tags

CCSS.5.NBT.B.7

What is the subtraction sentence that represents this model?

• 1.33 - 0.35

• 133 - 35

• 1.33 - 35

• 1.33 + 0.35

Tags

CCSS.5.NBT.B.7

What is the difference?

• 98

• 0.98

• 9.8

• 1.33

Tags

CCSS.5.NBT.B.7