1. 2 6844 - 851 43 Whole Number Keywords & Layout IMPORTANT Addition 652 1 + 619 33 Key Words SumAddTotal Subtraction 808 1 Take-awayDifference 4 352 x9 3 168 1 Product Total Altogether Altogether 4 Multiplication Each For one Shared Division 216

2. Whole Number X 10 X 100 X 1000 ÷ 10 ÷ 100 ÷ 1000 X number gets BIGGER Simply adding 0 ’s 34 x 10 =340 527 x 100 =52700 102 x 1000 =102000 ÷ number gets SMALLER Simply removing 0’s 750 ÷ 10 =75 2500 ÷ 100 =25 932000 ÷ 1000 =932

3. Whole Number X 20 X 300 ÷ 30 ÷ 500 X number gets BIGGER 123 x 300 36900 ÷ number gets SMALLER 750 ÷ 30 75 ÷ 3 123 x 100 x 3 12300 x 3 750 ÷ 10 ÷ 3 5 73 2 5

4. Estimating Answers 23 x 36 ≈ 20 x 40 ≈ 800 11 x 206 ÷ 534 ≈ 10 x 200 ÷ 500 ≈ 2000 ÷ 500 ≈ 4 You should use estimation before doing ANY calculation so you have a rough idea of the answer before you start. 828 4.24

5. BODMAS 1.Brackets 2.Other 3.Division 4.Multiplication 5.Addition 6.Subtraction 200 – 25 x 2 = 200 – 50 = 150 80 ÷ (8 – 3) = 80 ÷ 5 = 16 = 4 x 60 + 10 = 240 + 10 = 250 4 x ( 48 + 12) + 10