1. Starter Questions 36 o

2. Learning Intention To explain how to divide by 20, 300, 4000 etc using our knowledge so far. Whole Numbers Multiply or Divide by 20,300,4000

3. Whole Numbers Example 1 :Calculate 20 x 52 20 can be written as 2 x 10 so we have : By combining our knowledge so far of “multiplying / dividing by 10, 100, 1000” and “multiplying / dividing by a single digit” we can do harder calculations. We use a TWO step process. Multiply or Divide by 20,300,4000 2 x 10 x 52 = Step 1 : 10 x 52 = Step 2 : 2 x 520 = 520 1040

4. Whole Numbers Example 2 :Calculate 44 x 30 30 can be written as 10 x 3 so we have : Multiply or Divide by 20,300,4000 44 x 10 x 3 = Step 1 : 44 x 10 =Step 2 : 440 x 3 = 440 1320 Example 3 :Calculate 300 x 35 300 can be written as 3 x 100 so we have : 3 x 100 x 35 = Step 1 : 100 x35 =Step 2 : 3500 x 3 = 3500 10500

5. Whole Numbers Example 4 : Calculate 16000 ÷ 200 To divide by 200, divide by 100 then divide by 2: Multiply or Divide by 20,300,4000 16000 ÷ 100 ÷ 2 = Step 1 : 16000 ÷ 1 00 = Step 2 : 160 ÷ 2 = 160 80

6. Whole Numbers Example 5 : Calculate 120000 ÷ 6000 To divide by 6000, divide by 1000 then divide by 6: Multiply or Divide by 20,300,4000 120000 ÷ 1000 ÷ 6 = Step 1 : 120000 ÷ 1 000 = Step 2 : 120 ÷ 6 = 120 20

7. Now try Ex 8 Ch1 page 19 Whole Numbers Multiply or Divide by 20,300,4000