Multiplication and times tables · Usually met around P2
6 and 9 times tables
×6: ×3 doubled. ×9: ×10 less one lot.
How to do it
Method
×6: ×3 doubled. ×9: ×10 less one lot
7 × 6 = 21 × 2 = 42, 7 × 9 = 70 − 7 = 63
Another way
Learn the table
7 × 8 = 56, 7 × 9 = 56 + 7 = 63
In full
×6 is ×3, then double (7×6 → 21 → 42). ×9 is ×10 take away one lot (7×9 → 70 − 7 = 63). The digits of any multiple of 9 add up to a multiple of 9 (63 → 6 + 3 = 9; 99 → 9 + 9 = 18). That's a free check, but it only catches some mistakes: 72 passes too. Repeated addition, or knowing the table by heart, also works.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
6 × 3
Show the answer and working
Answer: 6 × 3 = 18
6 × 3: ×6 is ×3 doubled, 3 × 3 = 9, 9 × 2 = 18
Example 2
6 × 8
Show the answer and working
Answer: 6 × 8 = 48
6 × 8: ×6 is ×3 doubled, 8 × 3 = 24, 24 × 2 = 48
Example 3
6 × 5
Show the answer and working
Answer: 6 × 5 = 30
6 × 5: ×6 is ×3 doubled, 5 × 3 = 15, 15 × 2 = 30
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