Free PDFGrade 3 · Math · 25 min
9 times table: times 10, take one away
Find any 9s fact by doing times 10 and taking one group away.
I can find 9 times a number by multiplying by 10 and subtracting the number.
A math video lesson with a free worksheet and answer key for teachers
About the video
In the video a child finds 9 times facts by doing times 10 and taking one group away. At home 2 players use the trick on 11 problems, saying both steps out loud, and also write the column pattern from 09 to 90. 9 groups of a number is 10 groups minus one group, so 9 x 7 = 70 - 7 = 63, and this works for big numbers like 9 x 12 = 108. Each time you add 9, the tens digit goes up by 1 and the ones digit goes down by 1.
What your child learns
- Find 9 x a number with times 10 minus the number
- Spot the tens and ones pattern in the 9 times table
- Check answers using the digit sum of 9
What's on the worksheet
- 1Predict first
- 2Record the steps
- 3What did you see?
- 4The math behind it
- 5Use the trick
- 6Jumps of 9
- 7Which is bigger?
- 8Word problems
- 9Explain it
You need
2 players (1 caller + 1 player), a pencil, a sheet of paper and this sheet for the caller.
Tip for the adult
Insist that your child says both steps out loud, for example 70, take away 7, 63, so you can hear where a mistake happens.
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