Class 8 Maths · Part 1 Chapter 5 · CBSE / NCERT
Number Play
Why divisibility tricks work. You’ll use letters to reason about odd, even and consecutive numbers, find remainders, and learn the tests for 3, 9 and 11 and digital roots.
11 short lessons · about 50 minutes in all
What you’ll learn
- 1Even and odd when adding and taking away4 min
- 2Writing consecutive numbers with one letter4 min
- 3Even numbers: full rows of 4, or a short row of 24 min
- 4Sums and multiples keep a factor5 min
- 5Writing a number as full groups plus leftover4 min
- 6One number, several divisors, the same leftover5 min
- 7Checking 9 with the digit sum5 min
- 8Checking 11 with alternating digits5 min
- 9Combining two divisibility tests5 min
- 10Digital roots4 min
- 11Digits in disguise5 min
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Even and odd when adding and taking away · about 4 minutes
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More Class 8 Maths
The other 13 chapters.
PART 1 · CH 1A Square and a Cube11 lessonsPART 1 · CH 2Power Play11 lessonsPART 1 · CH 3A Story of Numbers9 lessonsPART 1 · CH 4Quadrilaterals11 lessonsPART 1 · CH 6We Distribute, Yet Things Multiply9 lessonsPART 1 · CH 7Proportional Reasoning-18 lessonsPART 2 · CH 1Fractions in Disguise10 lessonsPART 2 · CH 2The Baudhayana Pythagoras Theorem9 lessonsPART 2 · CH 3Proportional Reasoning–29 lessonsPART 2 · CH 4Exploring Some Geometric Themes11 lessonsPART 2 · CH 5Tales by Dots and Lines11 lessonsPART 2 · CH 6Algebra Play10 lessonsPART 2 · CH 7Area10 lessons
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