Multiplication and times tables · Usually met around P2
7 and 8 times tables
×8: double three times. ×7: ×5 + ×2.
How to do it
Method
×8: double three times. ×7: ×5 + ×2
7 × 8 = 14 × 2 × 2 = 28 × 2 = 56
Another way
Learn the table
7 × 7 = 49, 7 × 8 = 49 + 7 = 56
In full
This is where most people get stuck. ×8 is double three times (7×8 → 14 → 28 → 56). ×7 is ×5 plus ×2 (6×7 → 30 + 12 = 42). Remember 7×8=56 as the run '5, 6, 7, 8'. Repeated addition, or knowing the table by heart, works as well.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
7 × 8
Show the answer and working
Answer: 7 × 8 = 56
7 × 8: ×8 is three doubles, 7 × 2 = 14, 14 × 2 = 28, 28 × 2 = 56
Example 2
5 × 8
Show the answer and working
Answer: 5 × 8 = 40
5 × 8: ×8 is three doubles, 5 × 2 = 10, 10 × 2 = 20, 20 × 2 = 40
Example 3
2 × 7
Show the answer and working
Answer: 2 × 7 = 14
2 × 7: ×7 is ×5 and ×2, 2 × 5 = 10, 2 × 2 = 4, 10 + 4 = 14
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