Math Sept 25

Estimation

100

Using front-end estimation, solve the following:

56 + 33 + 87

160, 170, 180

200

Using front-end estimation, solve the following:

515 + 312

800 or 820

300

Using front-end estimation, solve the following:

1298 + 2335 + 1877

5000 or so

400

Using front-end estimation, solve the following:

You went shopping and bought items that cost $2.55, $4.65, $2.80, $3.15 and $7.25.  Approximately how much money did you spend?

Between $18 and $23

500

Using front-end estimation, solve the following:

Pippa just turned 13 years old.  Approximately how many days old is she?

using 10 x 400, she'd be 4000 days old.

using 13 x 400, she'd be 5200 days old. 

Exponents

100

Solve the following:

3² =

9

200

Solve the following:

7² =

49

300

What is 5³ written as repeated multiplication?

5 x 5 x 5

400

Solve the following:

2⁴ =

16

500

What exponent represents the following:

3 x 3 x 3 x 3 x 3

3⁵

Square Roots

100

What is the square root of 100

10

200

What is the square root of 144

12

300

Approximately what is the square root of 27?

about 5.2

400

Approximately what is the square root of 56

About 7.5

500

What two perfect squares does the number 75 fall between?

64 and 81

BEDMAS

100

5 + 3 x 2 =

11

200

10 - 4 x 2 + 3 =

5

300

(4 + 1) x (4 - 1) =

15

400

5² - 5 x 2

15

500

In BEDMAS, which do you do first: multiplication or division?

Whichever comes first in the expression when read from left to right.

(they don't need to describe this exactly as I have)

Powers of 10

100

Solve:

84 x 1000

84 000

200

Solve:

16.2 x 10

162

300

Solve:

 634 ÷ 10

63.4

400

Solve:

 85 x 0.01

0.85

500

Solve:

 94.2 ÷ 1000

0.0942