Recap: Multiplying 2-digit numbers - partitioning.
Today, I would like you to revise multiplying a 2-digit number by 1-digit using the method of partitioning that we looked at last week. Follow the link below to practise this again and try the multiplying 2-digit numbers quiz. If you are confident multiplying 2-digit numbers, try completing some of the one-step multiplication problems at the bottom of the page.
Can you multiply by two-digit numbers like 14 or 37?
It looks a bit difficult, doesn't it? It can be easier if you partition the number into two parts. Instead of multiplying by 29 you can multiply by 20 and then multiply by 9 separately and then add the answers together.
Instead of multiplying by 34 you can multiply by 30 and then multiply by 4 separately and then add the answers together.
3 x 34 = ?
Split the 34 into 30 and 4.
3 x 30 = 90
3 x 4 = 12
Then add these together
90 + 12 = 102