A hundred chart or grid is probably something your child is familiar with. There are many creative ways to use the chart to help your child build their understanding. Here’s some of our favourites:
- 1. Search for patterns. The number chart is great for visually seeing the patterns which exist. What does 14+4, 24+4, 34+4 etc have in common? Find other subtraction and addition patterns.
- 2. Make a Sieve of Eratosthenes which is an ancient way to find Prime Numbers! On our chart black out the box for number 1 which is not a prime or composite number. Move on to the next number which is 2. Put a little box around
the number in a colour. Now go through and colour in the same colour, all the numbers which are divisible by 2. Once you’ve finished go back and move to the next unmarked number which should be 3. Let’s put another different
coloured box around number 3. Colour in every third number that isn’t already coloured in. Once you’ve done that move on to the next number which hasn't been coloured. Put another different coloured box around number 5 and
colour in every 5th box after it. Do the same process for the next uncoloured number which should be 7. All the numbers that are not prime numbers are coloured in. The prime numbers should be boxed or uncoloured!
- 3. Play Multiples and Factor games! Two players are needed. The first player marks out a number on the chart which is less than 50. The next player must mark a factor or multiple of that number. Alternate players each time and
the player who marks the last number leaving the other player with no moves left, wins the game!
- 4. The hundred chart can also help with fractions and decimals. Ask your child to find a number which is 2/5 of a hundred? Or ¾.
Let us know if you can think of any other ways to use the hundred chart and we’ll add it to our list!