Multiplication Strategies Revision

Multiplication

• Place Value Strategy

(Good for problems that have multiple digit numbers that end in 1, 2, 3, 4, 5)

Eg. 6 x 15 = (6 x 10) + (6 x 5)

= 60 + 30

= 90

• Rounding and Compensating Strategy

(Good for problems that have multiple digit numbers that end in 6, 7, 8, 9)

Eg. 7 x 19 = (7 x 20) - (7 x 1)

= 140 - 7

= 133

• Doubling and Halving Strategy (Can also be applied as Tripling and Thirding)

E.g 5 x 46 = 10 x 23  (Double the ‘5’, and halve the ’46’)

= 230 

Or. 3 x 24 = 9 x 8     (Triple the ‘3’ and third the ’24’)