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# Year 4

### We can multiply and divide mentally, including multiplying by 0 and dividing by 1

#### What we are learning:

• It is important to understand and remember what happens when we multiply by 0 or divide by 1
• When we multiply any number by 0, the answer is always 0, for example zero lots of 4 is nothing
• To demonstrate this set out 4 and then remove them to show that if you had no piles of 4 you would have nothing
• When we divide any number by 1 the answer is the number you started with, for example 12 divided into piles of 1 would give you 12 piles of 1 so the answer is 12
• To extend our ability in mental maths we are now multiplying 3 numbers together in our heads

#### Activities you can do at home:

Write some numbers and then multiply them by 0 and divide them by one.
Use large numbers and numbers with decimals to make it fun.
Now try the same but without writing them down. This will help in remembering how to say large numbers.
Have a go at doing other mental multiplication and division sums, adding in some examples of multiplying by 0 and dividing by 1.

Have a go at these mental multiplication sums and then invent some similar examples for yourself using number facts that you know your child is familiar with:
2x6x5=
3x10x3=
200x3x6=
7x9x100=
Remember these sums can be done in any order, so talk to your child about which order they could do the sums in, which is quicker for them.