How to use the chart
To find 7 × 8, put one finger on 7 in the left column and another on 8 in the top row. Slide the first finger across and the second down until they meet, at 56. For division, work backwards: to find 56 ÷ 7, go along row 7 until you reach 56, then look up to the top of that column, which shows 8.
The chart is a tool for learning, not a crutch for ever. Use it to check answers and to hunt for patterns. Then cover it.
Patterns to look for
- The diagonal of squares. The shaded boxes from top left to bottom right are 1, 4, 9, 16, 25 and so on: each number times itself.
- Mirror halves. The chart is the same on both sides of that diagonal. 3 × 8 and 8 × 3 both hold 24. So only half the chart needs learning.
- Only 42 different answers. The 1 to 10 chart has 100 boxes but only 42 different numbers in them, because so many repeat.
- Numbers that appear once. In the 1 to 10 chart, 1, 25, 49, 64, 81 and 100 appear in just one box each. All of them are squares on the diagonal.
- Numbers that appear four times. 6, 8, 10, 12, 18, 20, 24, 30 and 40 each appear in four boxes, because each can be made in two different ways, such as 12 = 2 × 6 = 3 × 4.
- Even and odd. Three quarters of the boxes hold even numbers. An odd answer needs both numbers to be odd.
- Differences along the diagonal. Going from one square to the next you add 3, then 5, then 7, then 9: the odd numbers in order.
A chart is also an area picture
Count the boxes in the rectangle that runs from the top left corner to the box for 4 × 6. There are 4 rows of 6 boxes, 24 in all. So each product on the chart is the area of a rectangle. This is why multiplication is used for area, and why the squares on the diagonal are called squares.
Games with the chart
- Cover five boxes with coins and ask the child to say what is under each.
- Call out an answer such as 36 and ask for every box that holds it.
- Print a blank grid from the print page and fill it in against a timer, once a week, to see the time fall.
Read each table on its own page from the home page, or try a practice round.