G5 Math - Decimal Multiplication and Division

G5 Math - Decimal Multiplication and Division

By Max Chang

Multiple Select

A decimal number contains...

• fractional part

• decimal point

• negative symbol

• whole number part

When do we use decimals?

• Money transactions in pounds or dollars

• cooking using grams

• measuring precisely in woodwork or textiles

• periodic table for most accurate atomic mass

• weighing humans , when on a diet every point counts!

Subject | Subject

Some text here about the topic of discussion

Open Ended

As we know, fractions and decimals are interchangeable. Why do we still need to learn two types of expression when they are actually the same thing?

• 0.4

• ​3.6666666

• 11.571428​

• ​0.194636

Decimals

• ​2/5

• ​11/3

• 81/7​

• 254/1305​

Fractions

Fractions VS Decimal​s

Some text here about the topic of discussion

Multiplication of decimals​

Multiplication of decimals is done by ignoring the decimal point and multiply the numbers, and then the number of decimal places in the product is equal to the total number of decimal places in both the given numbers.

Subject | Subject

Some text here about the topic of discussion

Multiplication of decimals is done by ignoring the decimal point and multiply the numbers, and then the number of decimal places in the product is equal to the total number of decimal places in both the given numbers.

Multiplication of decimals​

Multiple Choice

Which Equation matches the model? 

• .4 x .2 = 0.8
• 0.6 x 0.1 = 0.06
• 0.2 x 0.4 = 0.8
• 0.2 x 0.4 = 0.08

Multiple Choice

Which equation matches the model?

• 0.4 x 0.3 = 0.12
• 12 x 0.3 = 3.6
• 3 x 4 = 12
• 3 x .12 = 0.36

Multiple Choice

42.1 X 8.8 =

• 370.48
• 410.59
• 78.26
• 891.26

Multiple Choice

Oliver bought 7 bags of candy. Each bag costs $1.50. How much money did he have to pay?

• $7.50
• $8.50
• $10.50
• $105.00

Multiple Choice

Sarah jogged 4.8 miles each day for 22 days last month.  How many miles did Sarah jog in total?

• 110 miles
• 105.6 miles
• 88.16 miles
• 26.8 miles

Multiple Choice

Which equation is represented by the model?

• 0.09 ÷ 6 = 0.6

• 0.9 ÷ 3 = 0.3

• 9 ÷ 3 = 3

• 0.9 ÷ 0.3 = 3

Multiple Choice

Calculate the quotient:
Divisor: 1.4
Dividend: 9.8

• 7
• 0.7
• 0.07

Multiple Choice

26.93 $$\div$$  9 =

• .297

• 2.97

• 297

• 29.7

Multiple Choice

32.5 $$\div$$  5 =

• 65

• .65

• 6.5

• 65

Multiple Choice

4 $$\div$$  3.2 =

• 1.25

• .125

• 12.5

• 125

Multiple Choice

$$49.5\div4.5$$  

• 1.1

• 11.2

• 11

• .11

Multiple Choice

2.1 ÷ 0.07

• 0.3

• 3

• 30

• 300