Free PDFGrade 5 · Math · 35 min
Is it divisible by 7?
Jump to YES or NO and learn a smart trick to test any number for 7.
I can decide if a number is divisible by 7 and use the double-and-subtract trick.
A math video lesson with a free worksheet and answer key for teachers
About the video
In the video players jump into a YES or NO square to show whether a number is divisible by 7. At home 4 or more players tape two squares on the floor, and a caller reads 12 numbers from 28 to 161 while the jumpers choose a square.
A number is divisible by 7 when it splits into groups of 7 with nothing left over. For big numbers, double the last digit and subtract it from the rest: if the answer is in the 7 times table, the number is divisible by 7, for example 161 gives 16 - 2 = 14.
What your child learns
- Decide if a number is divisible by 7
- Use the double and subtract trick on 3 digit numbers
- Check answers with the 7 times table
What's on the worksheet
- 1Predict first
- 2Record your jumps
- 3What did you see?
- 4The math behind it
- 5Use the trick
- 6YES square or NO square?
- 7True or false
- 8Calculate it
- 9Explain it
You need
4 players or more (1 caller + at least 3 jumpers), coloured tape, a floor space of about 3 m x 2 m, a pencil and this sheet for the caller.
Safety
Play on a non-slip floor in socks or trainers, and leave 1 m between jumpers.
Tip for the adult
After the game, ask your child to use the trick on 119 and 143, the two numbers players most often get wrong.
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