M2.3.4 For the adult
The 3, 4 and 8 times tables
I know my 4 times table. How can that help me with the 8 times table?
What this chapter teaches
The 3 and 4 tables come from counting in 3s and 4s. The 8 table is double the 4 table, so 8 × 7 is double 4 × 7. A near but wrong fact is a common slip: 54 is 6 × 9, not 8 × 7.
Three questions to ask
There is no one right wording. Listen for the idea.
- How could you find 8 × 7 if you know 4 × 7?
- What do you notice about the last digits in the 4 and 8 times tables?
- How could you check that 8 × 7 is not 54?
After the chapter, the learner can
- Say the 3, 4 and 8 times tables
- Get the 8 times table by doubling the 4 times table
What they copy into their notebook
Count in 3s and 4s. The 4 times table is double the 2 times table. The 8 times table is double the 4 times table. 8 × 7 = 28 + 28 = 56.