Class 7 Mathematics — Chapter 6: NUMBER PLAY

What you'll learn

• ▸Logical Reasoning with Number Sequences
• ▸Parity of Numbers (Even and Odd)
• ▸Arithmetic with Parity
• ▸Problem Solving using Parity
• ▸General Formulas for Even and Odd Numbers
• ▸Parity of Algebraic Expressions
• ▸Number Grid Puzzles
• ▸Magic Squares

Chapter Summary

--- PAGE 1 --- 6 NUMBER PLAY 0774CH06 6.1 Numbers Tell us Things ? What do the numbers in the figure below tell us? Remember the children from the Grade 6 textbook of mathematics? Now, they call out numbers using a different rule. 0 1 2 2 1 2 1 ? What do you think these numbers mean? The children rearrange themselves and each one says a number based on the new arrangement. 0 1 2 2 5 6 ? Could you figure out what these numbers convey? Observe and try to find out. --- PAGE 2 --- Ganita Prakash | Grade 7 The rule is — each child calls out the number of children in front of them who are taller than them. Check if the number each child says matches this rule in both the arrangements. ? Write down the number each child should say based on this rule for the arrangement shown below. ? Figure it Out 1. Arrange the stick figure cutouts given at the end of the book or draw a height arrangement such that the sequence reads: (a) 0, 1, 1, 2, 4, 1, 5 (b) 0, 0, 0, 0, 0, 0, 0 (c) 0, …

Practice Questions from this Chapter

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1. Explain why zero is an even number. Get Solution →
2. Show examples of number patterns in nature. Get Solution →
3. Quiz me on even and odd numbers. Get Solution →
4. In the 'Number Play' game described in the chapter, what rule do the children use to call out their numbers? Get Solution →
5. According to the 'Number Play' game rules, what number must the first person in line always say? Get Solution →
6. What is the term used in the text to denote the property of a number being even or odd? Get Solution →
7. According to the pictorial proofs in the chapter, what is the parity of the sum of two odd numbers? Get Solution →
8. What is the resulting parity when you add an even number and an odd number together? Get Solution →

Did you know?

• 💡 The number zero was not invented until thousands of years after other numbers.
• 💡 Prime numbers, except for two, are always odd and help secure online data.
• 💡 The Fibonacci sequence describes patterns found in petals, shells, and hurricanes.
• 💡 Ancient Babylonians used a base-60 number system, unlike our familiar base-10.
• 💡 The sum of any two consecutive numbers is always an odd number.

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