Adding Decimals
Subtracting Decimals
Rounding
Mental Math & Estimating
100

0.25 + 0.48


A 0.23
B 0.43
C 0.63
D 0.73

What is D? (0.73)

100

0.76 − 0.32

A 0.44

B 0.48

C 1.08

D 1.18

What is A? (0.44)

100

Round 102.567 to the nearest tenth?

What is 102.6?

100

Use mental math to add:

28.8 ?+ 0.2 ?+ 2

What is 31?

200

1.42 + 0.39


A 1.94
B 1.81
C 1.17
D 1.03

What is B? (1.81)

200

Subtract.

52.5 - 44.3

What is 8.2?

200

Round 3,482.301 to the nearest hundreth?

What is 3,482.3?

200

Use mental math to subtract:

5.88 -? 3.0

What is 2.88?

300

3.08 + 0.26


A 3.34
B 3.24
C 3.14
D 3.04

What is A? (3.34)

300

Subtract.

9.387 - 5.274

What is 4.113?

300

Round 345,942 to the nearest ten thousand?

What is 350,000?

300

Estimate 116 ?+ 78

What is 200?

400

26.042 + ?58.375


A 74.317
B 74.417
C 84.317
D 84.417

What is D? (84.417)

400

Estimate 8,879 -? 4,254.


A 5,000
B 4,000
C 3,000
D 2,000

What is A? (5,000)

400

Round 1,994,638 to the nearest thousand

What is 1,995,000?

400

Round to the nearest whole number to estimate:


8.76 +? 12.32 ?+ 6.18

What is 27?

500

Maria spent $7.99 on a book and $12.75 on art supplies. How much did she spend on the book and art supplies altogether?


A $20.64
B $20.74
C $29.64
D $29.74

What is B? ($20.74)

500

Mikayla earned $23.50 helping her neighbor with yard work. She spent $7.95 on some school supplies. 

Which equation could be used to find how much money she has left?


A 23.5 ?+ 7.95 ?= n
B n ?x 23.5 ?= 7.95
C 23.5 ?- 7.95 ?= n

What is C?

23.5 ?- 7.95 ?= n

500

Round 1,994,638 to the nearest hundred thousand

What is 2,000,000?

500

Estimation Lowell bought a drink for $1.90, a sandwich for $2.25, and an apple for $.75. Which is the best estimate of how much money he spent?


A $4.00
B $5.00
C $6.00
D $7.00

What is B? ($5.00)