Add, Subtract and Estimate

Subtracting With Decimals

100

3.9 - 2.2 =

1.7

200

5.0 - 2.6 =

2.4

300

0.81 - 0.48 = 

0.33

400

7.1 - 2.6 = 

4.5

500

140.0 - 131.0 = 

9

Adding With Decimals

100

2.6 + 3.8 = 

6.4

200

97 + 2.5 =

99.5

300

14.8 + 4.1 = 

18.9

400

1.38 + 12.9 =

14.28

500

20.2 + 0.345

20.545

Rounding Decimals

100

Round 0.56 to the nearest tenth

0.6

200

Round 3.49 to the nearest tenth.

3.5

300

Round 0.864 to the nearest hundredth.

0.86

400

Round 743.00 to the nearest hundred.

700

500

Steven has 555 marbles in his collection. When asked how many he has to the nearest hundred, he should say:__________

600

Estimate by rounding each number to the nearest 10

100

Estimate the product. Round each factor to the nearest ten, then multiply. 

65 x 27

2100

200

Estimate the product. Round each factor to the nearest ten, then multiply.  

88 x 59 =

5400

300

Estimate the product. Round each factor to the nearest hundred, then multiply.  

229 x 16

4000

400

Estimate the product. Round each factor to the nearest ten, then multiply.

 56 x 28

1800

500

Estimate the product. Round each factor, then multiply.  

845 x 72

56 000

Miscellaneous

100

What animal often sleeps standing up?

A horse

200

How many months have 28 days?

All of them!

300

What colour do you get when you mix blue and yellow?

Green

400

What is the smallest prime number?

2

500

List one word that is spelt the same forwards as it is backwards? (Names will not count!!)

Examples: 

Racecar, level, taco cat, mom, dad, etc.