World Maths Day

Today is World Maths Day so here are some fun number facts curteousy of Biggest Littlesheep:

  • if the total of the digits = 9 then the number is divisible by 9
  • to multiply by ten add a zero
  • to multiply by five, add a zero and halve it
  • all even numbers are divisible by two
  • to add on 9 add 10 and take-away 1
  • two minus numbers multiplied gives a postive number
  • to multiple any number between 1 and 9 by 9 hold both hands in front of your face, drop the finger that corresponds to the number you are multiplying (for example in 9×3, drop your third finger), count the fingers before the dropped finger (in the case of 9×3 it is 2) then count the numbers after (in this case 7). The first number is the tens and the second is the units (in the example the answer is 27)
  • to multiply by 4, double it and double it again
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