Year 4’s NSPCC Number Day Extra Problems

Here’s some extra challenges to get your teeth into this Number Day!

Post your answers below.

REMEMBER: Justify your always, sometimes or never with evidence and examples!


  1. Year 6 think this is true. Every even number is divisible by two, and if you add TWO of these, they can still be shared into groups of two easily. Proof: 2 + 2 = 4
    16 + 12 = 28
    2758 + 5342 = 8100

  2. I think this is sometimes because if you add
    3 and 2 and you will get five and that’s an odd number also if I did 175,000 + 170,000= 349,000 which is an even number

  3. Doubling a number results in an even number:
    Always,an odd number leaves a remainer of 1 when divided by 2. This means that when two odd numbers are added together it results in an answer of 2 therefore when you add them together your answer will be an even number, when you add two even numbers you just have a multiple of two. An example of an odd number:
    5(odd) multiplied by 2 is 10 because you end up with 2 remainders it is sort of like doing the below:↓
    4+4=8 8+2(2=remainders)=10

  4. I am going to answer the bottom right square! The answer is sometimes because for example 21+4+10=35 but 4+10+12=26!!

  5. On the 1st one on the secand row is … WRONG becuse 3+3=6. and 6 is a even number and 5+5=10 is even !! What a brillant blog

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