What this worksheet covers
The 9s are full of patterns, and this sheet is a good place to point them out. The digits of every multiple of 9 up to 9 × 10 add up to 9, and the tens digit is one less than the number multiplied: 9 × 4 is 36, with 3 tens and 3 + 6 = 9. Every problem has a 9 in it, with the other factor from 2 to 10 in either order, and there are nine facts.
Who it is for
Third grade, 3.OA.C.7. It is usually the last table to fall into place, because it can be built from the 10s: 9 × n is 10 × n minus n.
The 9 times table, from 9 × 2 to 9 × 10 · grade 3
A worked example
For 9 × 7, take 10 × 7 = 70 and subtract 7 to get 63. Check with the digits: 6 + 3 = 9. Use the finger method too, for fun: put down the seventh finger and read 6 fingers on the left and 3 on the right.
Mistakes to watch for
- Using the pattern for 9 × 11 or 9 × 12, where the digits no longer add up to 9. Keep the rule to products through 9 × 10.
- Subtracting from the wrong ten, for example 9 × 6 as 70 − 6. Say it with the numbers: ten sixes, take away one six.
Make it your own
This sheet is one setting of the math worksheet generator. Open it there to change the skill, the range of numbers or the heading, or to mix several skills on one sheet.