Let’s remember 2 things

1. Multiplying by 10,100,1000

Multiply by 10

Multiply by 100

Multiply by 1000

Add one 0 Add two 0’s Add three 0’s

since 10 has one 0

since 100 has two 0’s

since 1000 has three 0’s

Shortcut?S

So how do we work these out?

a) 730 ÷ 10 = 73( a zero was removed)

b) 1 900 000 ÷ 100 = 19000 (two zeros were removed)

c) 17 3 006 000 ÷ 1000 =173006 (three zeros were removed)

So, for division we REMOVE the 0’s

But what if the whole number does

NOT end in 0’s?

2. Dividing whole numbers with remainders

So how do we work these out?a) 18 ÷ 10= 1 remainder 8 or 1.8

b) 374 ÷ 10= 37 remainder 4 or 37.4

c) 257 ÷ 100= 2 remainder 57 or 2.57

d) 81352 ÷ 1000= 81 remainder 352 or 81.352

ShortcutDivide by 10 Divide by 100 Divide by

1000

Move decimal

point to the left once

 

 Move

decimal point to the left

twice 

 Move decimal point to the left three

times 

since 10 has one 0

since 100 has two 0’s

since 1000 has three 0’s

To Divide by 10,100,1000

•REMOVE 0’sor

•Move point to the left

Examples

23 ÷10 = 2 3 = 2.3

25000 ÷ 100= 2 5 0 0 0= 250

Examples

12350 ÷ 1000= 1 2 3 5 0 = 12.350

624 ÷ 100= 6 2 4 = 6.24

Online Game

https://www.mangahigh.com/en/maths_games/number/calculations_with_whole_numbers_(integers)/multiply_and_divide_whole_numbers_by_10,_100_and_1000

12.3 14.2 3.2 2

÷ 10

1.23 1.42 0.32 0.2

Answers

532 234 320 210

÷ 100

5.32 2.34 3.2 2.1

Answers

3.2 34.2 332.1 253

÷ 1000

0.0032 0.0342 0.3321 0.253

Answers

HomeworkPg 26 Exercise 2g

Work out (giving your answers in decimal form)

1-12