Do you want to be a maths genius? Get ready because you’re about to learn a super cool trick of how to count in nines!
Counting in nines means adding 9 to a number. Have a look at the numbers below:
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108
If you buy 9 ice creams and you want to buy 9 more, how many ice creams will you have?
Use your fingers to count.
You will have 18 ice creams. To check you got the number right, here’s a trick to help you.
Look at the number 18. Now split the numbers up: 1 and 8
1 + 8 = 9
Whenever you count in nines, the numbers always add up to 9. How cool is that!
If you have 18 ice creams and you buy 9 more, you will have 27 ice creams:
2 and 7
2 + 7 = 9
Wow, you’re a maths wizard! There’s just one thing to remember, this trick doesn’t work when you reach the 11th number. 9 lots of 11 are 99. Magic can’t always work!
Now get your wand ready and try and solve these questions.
