Decimal Multiplication and Division

Decimal Multiplication

100

What is the product of 2.5 and 4

10

200

 3.2 X 0.5?

1.6

300

What is 0.6 x 0.3?

0.18

400

5.67 x 0.2? How many digits are to the right of my decimal point in my answer?

The product is 1.134; you count 3 decimal places in total

500

4.67 x 3.29

15.3643

Whole/Decimal

100

4 / 0.1

40

200

8 / .02

400

300

35 / .5

70

400

6 / .06

100

500

683 / .02

34,150

Decimal/Whole

100

.6 / 4 

.15

200

.8 / 2

.4

300

1.21 / 11

0.11

400

14.4 / 2

7.2

500

.683 / 2

.3415

Decimal/Decimal

100

.8 / .1

8

200

2.55 / .05

51

300

.9 / .3

3

400

.3 / .9

.3333333333333333333333333333333333

500

.72 / .072

10

Common mistakes/Random

100

What is a common error when multiplying decimals?

Forgetting to count decimal places correctly. Lining up decimals and dropping it straight down into answer.

200

What happens if you forget to place the decimal in division?

The result can be much larger than expected.

300

How many ribs does a human skeleton have?

12

24

36

22

24

400

What is a frequent mistake that students make with decimal division?

Not placing the decimal correctly.

500

Which planet has the most volcanoes?

Earth

Mars

Saturn

Jupiter

Mercury

Venus

Venus