Stage 3 · Times tables
×7 and ×8
×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 stall. ×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 learning the table by heart works too; the answers are the same.
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
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
Example 2
8 × 11
Show the answer and working
Answer: 8 × 11 = 88
8 × 11: ×8 is three doubles, 11 × 2 = 22, 22 × 2 = 44, 44 × 2 = 88
Example 3
6 × 7
Show the answer and working
Answer: 6 × 7 = 42
6 × 7: ×7 is ×5 and ×2, 6 × 5 = 30, 6 × 2 = 12, 30 + 12 = 42
Example 4
11 × 7
Show the answer and working
Answer: 11 × 7 = 77
11 × 7: ×7 is ×5 and ×2, 11 × 5 = 55, 11 × 2 = 22, 55 + 22 = 77
Practise ×7 and ×8 in the game →Stage 3 · Times tables · Free to start, unlimited questions, no download