Estimating decimals Sums and Differences

A (n) ______________ is an approximate answer

• sum

• estimate

• product

Tags

CCSS.L.2.4E

CCSS.L.3.4D

CCSS.L.6.4C

CCSS.L.7.4C

CCSS.L.8.4C

In the equation 497.55 - 265.41 = 232.14, the number 232.14 is the _________________

• difference

• quotient

• compatible numbers

Tags

CCSS.5.NBT.B.7

In the equation 8.9 + 55.2 = 64.10, the number 64.10 is the _________________

• difference

• sum

• product

Tags

CCSS.5.NBT.B.7

Round to the nearest WHOLE number to find the sum: 34.87 + 20.41

• 55

• 55.28

• 54

• 50

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Round to the nearest WHOLE number to find the sum:

44.56 + 14.72

• 59.28

• 50

• 60

• 58

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Round to the nearest TEN to find the sum:

19.36 + 12.88

• 32.24

• 31

• 32

• 30

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Round to the nearest HUNDRED to find the difference:

576.76 - 231.84

• 200

• 300

• 400

• 344.92

Tags

CCSS.5.NBT.A.4

CCSS.5.NBT.B.7

Estimating is finding a value that is CLOSE or APPROXIMATE to the actual value, but it's not exact.

• True

• False

Tags

CCSS.5.NBT.A.4

CCSS.5.NF.A.2

What are compatible numbers?

• Two of the same numbers.

• Numbers that have the same digit in the ones place.

• Pairs of numbers that are easy to add, subtract, multiply, or divide mentally.

• Numbers that have the same amount of digits.

Choose a good pair of compatible numbers to make finding the sum of 223.4 + 148.9 easier to add mentally.

• 200 + 100

• 223 + 149

• 225 + 150

• They're already compatible.