Download presentation

Presentation is loading. Please wait.

Published byJustin Hutchison Modified over 4 years ago

1
Our Ladys Primary School Halloween Video Conference Part 2

2
Times Table Challenge We have been using our knowledge of the times tables to solve problems The times table was given in the form of letters, such as: C x A = BF The challenge for us was to work out which times table it was, then work out what number each letter represented.

3
Here is the times table: J x J = HJ J x D = HC J x G = AJ J x I = DC J x B = AC J x F = J J x E = DJ J x H = FC J x A = FJ

4
How did we solve the problem? First, we noticed that there was only one single digit answer. This meant that it couldnt be the 2,3 or 4 times tables. Then we noticed a pattern in the answers – they all ended with either J or C. Which times table answers end with only 2 different digits? There is only one - the FIVE times table! Now we just had to work out what number every letter stood for.

5
First, we looked at: J x F = J We knew that a number multiplied by 1 is itself, so F =1; Then we looked at J x J = HJ We knew that 5 x 5 = 25 and that J=5, so this meant that H=2. We carried on like this and eventually found all the numbers which the letters represented.

6
We have been looking at the two times table: We have learned what multiple means A multiple of 2 divides exactly by two with none left over. We have found that all multiples of two are even We know that all even numbers end in 0, 2, 4, 6 or 8. We coloured all the multiples of 2 on a number square.

7
We have been looking at quick ways to spot multiples of 2, 5 and 10: We found out that all multiples of 10 end in 0; For example: 50, 80, 120, 450, 100, 1000 are all multiples of ten. We coloured all the multiples of 10 on a number square.

8
We found out that all multiples of 5 end in either 5 or 0; For example: 15, 40, 110, 205, 355, 500 are all multiples of 5. We coloured all the multiples of 5 on a number square

9
We found out that all multiples of 2 end in 0, 2, 4, 6 or 8; We found out that all multiples of 10 are also multiples of 5 and 2. So the only digit we need to look at is the units digit to spot multiples of 2, 5 or 10!

10
On the same number grid, we coloured all the multiples of 2 yellow, multiples of 5 blue and multiples of 10 red. Some of the numbers stayed yellow and some of the numbers stayed blue, but some of the numbers turned brown – these are all multiples of 2 and 5 and 10!

11
Thank you for listening to our presentation. We hope to see you all again sometime. Keep learning all your times tables!

Similar presentations

OK

What does multiple mean?. X2 TABLE: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 2 4 6 8 0, 2 4 6 8 0, 2 4 6 8 0… What pattern do you notice? 12 24 56 98 106 114.

What does multiple mean?. X2 TABLE: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 2 4 6 8 0, 2 4 6 8 0, 2 4 6 8 0… What pattern do you notice? 12 24 56 98 106 114.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google