Free PDFGrade 6 · Math · 35 min
Is it divisible by 15?
Jump to the right side or the wrong side, and test numbers for 3 and 5 at once.
I can test if a number is divisible by 15 by checking 3 and 5.
A math video lesson with a free worksheet and answer key for teachers
About the video
In the video players jump to a RIGHT or WRONG zone depending on whether a number is divisible by 15. At home 4 or more players tape a start line and two zones, and a caller reads 12 numbers from 45 to 210. 15 = 3 x 5, so a number is divisible by 15 only when it passes both tests: it ends in 0 or 5, and its digit sum is divisible by 3. This works because 3 and 5 have no common factor except 1.
What your child learns
- Test numbers for 5 using the last digit
- Test numbers for 3 using the digit sum
- Combine both tests to check divisibility by 15
What's on the worksheet
- 1Predict first
- 2Test the numbers
- 3What did you see?
- 4The math behind it
- 5Right zone or wrong zone?
- 6Find the missing digit
- 7True or false
- 8Calculate it
- 9Explain it
You need
4 players or more (1 caller + 3 or more jumpers), coloured tape and this sheet for the caller.
Safety
Socks or trainers on a non-slip floor, and 1 m between jumpers.
Tip for the adult
Watch for 95 and 72, which pass only one of the two tests and are the most common traps.
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