Mental Math _ 2

Multiplying Polynomials

100

(4a)(5b)

20ab

200

3(8a + 2)

24a + 6

300

4b(3b -7)

4b² - 21b

400

2k²(2k³ + 6k - 4)

4k⁵ + 12k³ - 8k²

500

abc(2a²b)

2a³b²c

Proportional Reasoning

100

1:2 = x:24

x = ?

12

200

3:4 = 75:x

x = ?

100

300

15:25 = 3:x

x = ?

5

400

3 : 4 : 5 = 51 : x : 85

x = ?

68

500

10 : 1 : 3 = 5 : x : 1.5

x = ?

0.5

Place Value

100

In 56.0392, which number is in the ones place?

6

200

In 0. 85391, which number is in the thousandths place?

3

300

If you rounded 2.98316 to the nearest tenth, what digit would be in the ones place?

3

400

What is the proper way to say this value in words?

7.26

Seven and twenty-six hundredths

500

Which number is read as two hundred seven thousand, one hundred forty-five and thirteen thousandths?

207 145.013

Comparing Decimals

100

Order from least to greatest...

3, -1, 4.3, -2.2

-2.2, -1, 3, 4.3

200

Which is the lowest value?

2.002, 2.001, 2.0009, 2.0019

Say it in words.

Two and nine ten thousandths

300

True or False?

-0.51 > -0.5

False

400

Is -4.5 greater than -4.4?

No

500

Which digit is in the hundred thousandths place?

0.987654321

5

Expanded to Exponential Notation

100

2 x 2 x 2 x 2

2⁴

200

3 x 3 x 3

3³

300

-1 x 4 x 4 x 4 x 4 x 4

-4⁵

400

(-7)(-7)(-7)(-7)

(-7)⁴

500

9 x 9 x 9 x 9 x 9 x 9 x 9

9⁷