M3.2.5 For the adult
Long division
How do I divide 7 870 by 23 on paper?
What this chapter teaches
Long division writes out the working that short division does in the head. A list of multiples of the divisor shows how many fit at each round. Each round is divide, multiply, take away and bring down.
Three questions to ask
There is no one right wording. Listen for the idea.
- Why does it help to write the multiples of 23 first?
- In 7 870 ÷ 23, why do we start with 78 and not 7?
- What do you do with the leftover after taking away?
After the chapter, the learner can
- Divide a 4 digit number by a 2 digit number
- Make a list of multiples to help with long division
What they copy into their notebook
Make a list of multiples of the divisor. Then repeat four moves: divide, multiply, take away, bring down. The last leftover is the remainder.