Number Sense Basics

No Calculators

100

Evaluate:

49 491 + 75 281

124 772

200

Evaluate: 

10 000 - 3823

6177

300

Evaluate: 

252xx8

2016

400

Evaluate: 

53.2-14.64

38.56

500

216-:8

Evaluate: 

27

Place Value

100

What is the place value of the 3:

831

tens

200

What is the place value of the 5:

15296

thousands

300

2.84

What is the place value of the 8:

tenths

400

What is the place value of the 1:

3.9761

ten thousandths

500

25438109

What is the place value of the 2:

10 millions

Rounding

100

Round to the nearest whole number: 

7.8

8

200

Round to the nearest 10: 

624

620

300

Round to the nearest thousands:

38885

39000

400

Round to the nearest ten: 

85.48

90

500

Round to the nearest hundredth:

525.298

525.30

Multiply by 10's, 100's and 1000's

100

634xx10

6340

200

8.2xx10

82

300

5.053xx1000

5053

400

0.38xx1000

380

500

16.015xx100

1601.5

Estimating

100

How far is Sobey's from the school?

a) About 100 m

b) About 1000 m

c) About 10 000 m

b) about 1000 m

200

An apple costs $1.25.  About how much does a dozen apples cost? 

Between $10 and $20

300

Estimate:

245xx89

about 24000

400

Estimate: 

892-: 41

about 20

500

Approximately how many times more expensive is the cost of a house compared to the cost of a car?

about 10 times as much