Using Number Bonds For Mental Multiplication & Division

Hi, I'm Rebecca. And in this film we're going to look at how we can use number bonds for mental multiplication and division. Now, number bonds are a way of showing how numbers can be combined and split up, and they're really useful way of doing mental maths. So here I have a calculation 26 times three and I can split my 26 into two parts, which will give me 26. Now I can carry on with my calculation. So I can do 20 times three and then I can do six times three. Now, 20 times 3 is 60 and 6 times 3 is 18, which would give us 78. So how would this look with division? If I have 54 divided by 3, I can use number bonds to help me. Now I need to know whether or not I'm going to use 54, 50 and 4 or a different number bond. 50 and 4 isn't going to help me divide by three, so I'm going to use a different one. I'm going to split 54 into 30 and 24. And now I can divide both of those numbers easily by three, because 30 and 24 are multiples of three. So 30 divided by three is 10 and 24 divided by three is eight and I can add them together to give me 18. So that's using number bonds for mental multiplication and division.