M2.3.5 For the adult
The 6, 7 and 9 times tables
I can never remember 6 × 7 or 9 × 8. Is there a trick?
What this chapter teaches
The harder tables are built from ones you know: sixes are double threes, nines are tens take away one group, sevens are fives plus twos. A common slip is taking away 9 instead of one group: 9 × 7 is 70 − 7, which is 63.
Three questions to ask
There is no one right wording. Listen for the idea.
- How could you work out 9 × 7 using 10 × 7?
- How can you use 3 × 8 to find 6 × 8?
- What do you notice about the digits in the answers to the 9 times table?
After the chapter, the learner can
- Say the 6, 7 and 9 times tables
- Work out 9 × 7 as 10 × 7 − 7
What they copy into their notebook
Sixes are double threes: 6 × 4 = 12 + 12. Nines are tens less one group: 9 × 7 = 70 − 7. Sevens are fives plus twos: 7 × 8 = 40 + 16.