Math-Unit 2A Review

Place Value

100

What is the expanded form of 17.28?

(1x10) + (7x1) + (2x1/10) + (8x1/100)

200

(8x10) + (2x1) + (5x1/10) + (9x1/100)

82.59

300

What is 903.013 in expanded form?

(9x100) + (3x1) + (1x1/100) + (3x1/1000)

400

(7x1000) + (3x10) + (8x1) + (5x1/100) + (4x1/1000)

7038.054

500

6x100 + 2x10 + 9x1/10 + 8x1/1000

620.908

Powers of 10

100

10¹= 

10²= 

10³=

10⁴=

10¹= 10

10²= 100

10³= 1,000

10⁴= 10,000

200

True or False:

0.07 x 10² = 7

True

300

True or False:

10³ x 0.009 = 0.9

False

400

Which of the following expressions will equal 3.8?

A. 38 x 10¹ 

B. 380 ÷ 10² 

C. 0.38 x 10¹ 

B and C

500

How are these two numbers related? (Hint: I am not asking you to compare them.)

0.08 and 0.8

0.08 is one tenth of 0.8

0.8 is ten times 0.08

Comparing/Rounding

100

Round 407.819 to the nearest tenth and hundredth.

tenth= 407.8

hundredth= 407.82

200

Compare 718.56 and 718.5

718.56 > 718.5

718.5 < 718.56

300

Which of the following will round to 6.5 when rounding to the nearest tenth?

A. 6.48

B. 6.42

C. 6.55

D. 6.53

A and D

400

0.45, 0.5, 0.045, 0.7

Which is the least? Which is the greatest?

least= 0.045

greatest= 0.7

500

Order these numbers from least to greatest.

28.75, 28.05, 28.57, 28.075

28.05

28.075

28.57

28.75

Adding/Subtracting

100

4.81 + 0.5

5.31

200

Slide 2

0.32 + 0.04 = 0.36

300

Slide 1

0.8 - 0.23 = 0.57

400

38.4 - 1.27

37.13

500

Make a fact family for the following equation:

21.08 - 13.45 = g

21.08 - 13.45 = g

21.08 - g = 13.45

g + 13.45 = 21.08

13.45 + g = 21.08

Final Jeopardy

500

Emma has three pieces of string. The lengths of the strings are 402.4 inches, 402.33 inches, and 421.08 inches. What is the difference in length between the longest and shortest strings? 

421.08 - 402.33 = 18.75