Math Review

Rounding

100

Round to the nearest tenth 

57 

60

200

Round to the nearest hundred

144

100

300

Round to the nearest whole number:

7.58 

8

400

Round to the nearest whole number

527.98

528

500

Round each number to the nearest hundred 

a) 9785 

b) 7320

a) 9800

b) 7300

Subtraction& Addition

100

546 - 224 = 

322

200

4785 + 798 = 

5583

300

7001 - 2875 = 

4126

400

198 - 75 + 8450 =

198 - 75 = 123 

123 + 8450 = 8573

Total is 8573

500

125 + 7802 - 855 =

125 + 7802 = 7927 

7927 - 855 = 7072

TOTAL is 7072

Mental Math

100

57 + 43 = 

57: 50 and 7 

43: 40 and 3

90 + 10 = 100 

200

95 - 35 = 

95  

35: 30 and 5 

95 - 30 = 65 

65 - 5 = 60

300

225 - 105 =

225 - 100 = 125 

125 - 0 - 5 = 120

400

385.5 + 405 = 

300 + 400 = 700

80 + 0 = 80 

5 + 5 = 10 

0.5 + 0 = 0.5 

Total : 790.5 

500

980.7 - 54.2

980 - 50 - 4 = 926 

0.7 - 0.2 = 0.5 

Total 926.5 

Missing Number

100

458 + _______ = 7458

7458 - 458 = 7000

Therefore the missing number is 7000

200

_________ - 1780 = 8450

8450 + 1780 = 10,230

Therefore the missing number is 10,230

300

721 + ________ = 8472

8472 - 721 = 7751

Therefore the missing number is 7751

400

______ - 1985 = 4102

4102 + 1985 = 6087

Therefore the missing number is 6087

500

______ + 4129 = 9700 

9700 - 4129 = 5571 

Therefore the missing number is 5571

Word Problems

100

In a smoothie there are 2.2 cups of strawberries, 3.7 cups of milk, and 1.5 cups of bananas. Approximately how many cups of ingredients are in this smoothie. 

2.2 ----> 2

3.7 ----> 4

1.5 ----> 2

8 cups of ingredients 

200

Tyler said that 245.79 rounded to the nearest whole number is 245. Kaleb said it was 246. Who is correct? 

Kaleb is correct because .7 is 5 and higher and you would round up. 

300

Belle bought 500.5cm of rope and cut it in 2 pieces. The first piece was 135.2cm. How long was the second piece? 

135.2 + _____ = 500.5

500.5 - 135.2 = 365.3 

The second piece was 365.3 cm

400

Emma's bakery sold 1242 cupcakes on Monday. On Tuesday, he sold 50 more than what he sold on Monday. On Wednesday, he sold 1345. How many cupcakes did he sell in all from Monday to Wednesday. Show your work. 

Monday - 1242 

Tuesday - 1292

Wednesday 1345

All--> 1242 + 1292 + 1345 = 3879

Emma sold 3879 cupcakes. 

500

Testimony and her family are going on a road trip. On Monday, they drove 450.3 km. On Tuesday, they drove 50.5 more kilometres than Monday. On Wednesday, they drove 375.3 km. How many kilometres did they drive in total? Show your work. 

Monday - 450.3 

Tuesday - 500.8 

Wednesday - 375.3

450.3 + 500.8 + 375.3 = 1326.4