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Page 1 53 ME NT AL MA T HS How Many Times Summary 5 5 5 5 5 5 = 30 beads. 6 groups of 5 beads each = 6 × 5 = 30 beads When each group has the same number, we used multiplication to find how many are there in all. or we can say that multiplication is repeated addition. Properties • Any number multiplied by 1 is that number itself i.e. 1 × 22 = 22, 135 × 1 = 135 • Any number multiplied by 0 is always zero i.e. 0 × 53 = 0, 227 × 0 = 0 • The numbers that are multiplied are called factors i.e. 12 × 5 = 60 Here 12 and 5 are factors and the answer so obtained is called product i.e. here 60 is product. +++ += + Page 2 53 ME NT AL MA T HS How Many Times Summary 5 5 5 5 5 5 = 30 beads. 6 groups of 5 beads each = 6 × 5 = 30 beads When each group has the same number, we used multiplication to find how many are there in all. or we can say that multiplication is repeated addition. Properties • Any number multiplied by 1 is that number itself i.e. 1 × 22 = 22, 135 × 1 = 135 • Any number multiplied by 0 is always zero i.e. 0 × 53 = 0, 227 × 0 = 0 • The numbers that are multiplied are called factors i.e. 12 × 5 = 60 Here 12 and 5 are factors and the answer so obtained is called product i.e. here 60 is product. +++ += + 54 ME NT AL MA T HS Questions 1. 6 + 6 + 6 + 6 + 6 = 6 × ________ 2. Total number of petals = ________ 3. In a class of 10 students each one has 5 books. What is the total number of books? 4. 7 times 6 is ________ 5. Put the required sign 5 × 4 = 5 _ 5 _ 5 _ 5 6. 8 × = 32 7. 36 is 4 times . 8. What is 3 + 3 + 3 + 3 + 3 + 3 + 3? 9. 5 added 8 times is 10. 6 nines added together will make 11. 14 ? 2 × 7 7 + 12. How many hours are there in 10 days? 13. How many minutes are there in 5 hours? 14. × = 15. A shirt has five buttons. How many buttons are there in 8 shirts? 16. If cost of one banana is ?5 then what is the cost of two dozen bananas? 17. How many corners are there in 8 triangles? 18. 34 × 2 is ________ times 2. Page 3 53 ME NT AL MA T HS How Many Times Summary 5 5 5 5 5 5 = 30 beads. 6 groups of 5 beads each = 6 × 5 = 30 beads When each group has the same number, we used multiplication to find how many are there in all. or we can say that multiplication is repeated addition. Properties • Any number multiplied by 1 is that number itself i.e. 1 × 22 = 22, 135 × 1 = 135 • Any number multiplied by 0 is always zero i.e. 0 × 53 = 0, 227 × 0 = 0 • The numbers that are multiplied are called factors i.e. 12 × 5 = 60 Here 12 and 5 are factors and the answer so obtained is called product i.e. here 60 is product. +++ += + 54 ME NT AL MA T HS Questions 1. 6 + 6 + 6 + 6 + 6 = 6 × ________ 2. Total number of petals = ________ 3. In a class of 10 students each one has 5 books. What is the total number of books? 4. 7 times 6 is ________ 5. Put the required sign 5 × 4 = 5 _ 5 _ 5 _ 5 6. 8 × = 32 7. 36 is 4 times . 8. What is 3 + 3 + 3 + 3 + 3 + 3 + 3? 9. 5 added 8 times is 10. 6 nines added together will make 11. 14 ? 2 × 7 7 + 12. How many hours are there in 10 days? 13. How many minutes are there in 5 hours? 14. × = 15. A shirt has five buttons. How many buttons are there in 8 shirts? 16. If cost of one banana is ?5 then what is the cost of two dozen bananas? 17. How many corners are there in 8 triangles? 18. 34 × 2 is ________ times 2. 55 ME NT AL MA T HS 19. There are 50 toffees in a packet. How many toffees are there in 6 packets? 20. Cost of a pencil in ?4. What is the cost is 15 such pencils? 21. How many times will you add 12 to set 108? 22. Arrange the following in increasing order: 2×8 11×10 12×6 3×5 (A) (B) (C) (D) 23. Arrange the following in decreasing order: 6×8 7×5 12×12 9×8 (A) (B) (C) (D) 24. How many legs 10 Octopus have? 25. 12 × 8 26. What is the product of 2, 12, 0 and 5? 27. What is the sum of 8 nines and 4 fives? 28. Product of two numbers is 72 if one of them is 9 then what is the other number? 29. If 250 × 15 = 3750 then 2500 × 15 = ________. 30. If 1500 × 12 = 18000 then 150 × 12 = ________. Page 4 53 ME NT AL MA T HS How Many Times Summary 5 5 5 5 5 5 = 30 beads. 6 groups of 5 beads each = 6 × 5 = 30 beads When each group has the same number, we used multiplication to find how many are there in all. or we can say that multiplication is repeated addition. Properties • Any number multiplied by 1 is that number itself i.e. 1 × 22 = 22, 135 × 1 = 135 • Any number multiplied by 0 is always zero i.e. 0 × 53 = 0, 227 × 0 = 0 • The numbers that are multiplied are called factors i.e. 12 × 5 = 60 Here 12 and 5 are factors and the answer so obtained is called product i.e. here 60 is product. +++ += + 54 ME NT AL MA T HS Questions 1. 6 + 6 + 6 + 6 + 6 = 6 × ________ 2. Total number of petals = ________ 3. In a class of 10 students each one has 5 books. What is the total number of books? 4. 7 times 6 is ________ 5. Put the required sign 5 × 4 = 5 _ 5 _ 5 _ 5 6. 8 × = 32 7. 36 is 4 times . 8. What is 3 + 3 + 3 + 3 + 3 + 3 + 3? 9. 5 added 8 times is 10. 6 nines added together will make 11. 14 ? 2 × 7 7 + 12. How many hours are there in 10 days? 13. How many minutes are there in 5 hours? 14. × = 15. A shirt has five buttons. How many buttons are there in 8 shirts? 16. If cost of one banana is ?5 then what is the cost of two dozen bananas? 17. How many corners are there in 8 triangles? 18. 34 × 2 is ________ times 2. 55 ME NT AL MA T HS 19. There are 50 toffees in a packet. How many toffees are there in 6 packets? 20. Cost of a pencil in ?4. What is the cost is 15 such pencils? 21. How many times will you add 12 to set 108? 22. Arrange the following in increasing order: 2×8 11×10 12×6 3×5 (A) (B) (C) (D) 23. Arrange the following in decreasing order: 6×8 7×5 12×12 9×8 (A) (B) (C) (D) 24. How many legs 10 Octopus have? 25. 12 × 8 26. What is the product of 2, 12, 0 and 5? 27. What is the sum of 8 nines and 4 fives? 28. Product of two numbers is 72 if one of them is 9 then what is the other number? 29. If 250 × 15 = 3750 then 2500 × 15 = ________. 30. If 1500 × 12 = 18000 then 150 × 12 = ________. 56 ME NT AL MA T HS Answer Key 1. 5 16. ?120 2. 15 17. 24 3. 50 18. 34 4. 42 19. 300 toffees 5. C 20. ?60 6. 4 21. 9 7. 9 22. D, A, C, B 8. 21 23. C, D, A, B 9. 40 24. 80 10. 54 25. 96 11. 7 26. 0 (zero) 12. 240 hours 27. 92 13. 300 minutes 28. 8 14. 3 29. 37500 15. 40 30. 1800 Page 5 53 ME NT AL MA T HS How Many Times Summary 5 5 5 5 5 5 = 30 beads. 6 groups of 5 beads each = 6 × 5 = 30 beads When each group has the same number, we used multiplication to find how many are there in all. or we can say that multiplication is repeated addition. Properties • Any number multiplied by 1 is that number itself i.e. 1 × 22 = 22, 135 × 1 = 135 • Any number multiplied by 0 is always zero i.e. 0 × 53 = 0, 227 × 0 = 0 • The numbers that are multiplied are called factors i.e. 12 × 5 = 60 Here 12 and 5 are factors and the answer so obtained is called product i.e. here 60 is product. +++ += + 54 ME NT AL MA T HS Questions 1. 6 + 6 + 6 + 6 + 6 = 6 × ________ 2. Total number of petals = ________ 3. In a class of 10 students each one has 5 books. What is the total number of books? 4. 7 times 6 is ________ 5. Put the required sign 5 × 4 = 5 _ 5 _ 5 _ 5 6. 8 × = 32 7. 36 is 4 times . 8. What is 3 + 3 + 3 + 3 + 3 + 3 + 3? 9. 5 added 8 times is 10. 6 nines added together will make 11. 14 ? 2 × 7 7 + 12. How many hours are there in 10 days? 13. How many minutes are there in 5 hours? 14. × = 15. A shirt has five buttons. How many buttons are there in 8 shirts? 16. If cost of one banana is ?5 then what is the cost of two dozen bananas? 17. How many corners are there in 8 triangles? 18. 34 × 2 is ________ times 2. 55 ME NT AL MA T HS 19. There are 50 toffees in a packet. How many toffees are there in 6 packets? 20. Cost of a pencil in ?4. What is the cost is 15 such pencils? 21. How many times will you add 12 to set 108? 22. Arrange the following in increasing order: 2×8 11×10 12×6 3×5 (A) (B) (C) (D) 23. Arrange the following in decreasing order: 6×8 7×5 12×12 9×8 (A) (B) (C) (D) 24. How many legs 10 Octopus have? 25. 12 × 8 26. What is the product of 2, 12, 0 and 5? 27. What is the sum of 8 nines and 4 fives? 28. Product of two numbers is 72 if one of them is 9 then what is the other number? 29. If 250 × 15 = 3750 then 2500 × 15 = ________. 30. If 1500 × 12 = 18000 then 150 × 12 = ________. 56 ME NT AL MA T HS Answer Key 1. 5 16. ?120 2. 15 17. 24 3. 50 18. 34 4. 42 19. 300 toffees 5. C 20. ?60 6. 4 21. 9 7. 9 22. D, A, C, B 8. 21 23. C, D, A, B 9. 40 24. 80 10. 54 25. 96 11. 7 26. 0 (zero) 12. 240 hours 27. 92 13. 300 minutes 28. 8 14. 3 29. 37500 15. 40 30. 1800 57 ME NT AL MA T HS ACTIVITY I. Shortcut to multiply by 11: Example: 23 × 11 = 253 Step 1: Write digit at unit’s place as it is Step 2: Add the digits at unit and tens place and write it at ten’s place Step 3: Write digit at tens place as it is at hundred’s place Now Solve: (i) 13 × 11 (ii) 25 × 11 (iii) 36 × 11 (iv) 27 × 11 (vi) 42 × 11 II. Activity • Take 3 consecutive numbers of 4, 5 and 6 • Multiply the middle number by itself i.e. 5 × 5 = 25 • Multiply the other two numbers i.e. 4 × 6 = 24 • Subtract the two products i.e. 25 – 24 = 1 Find out whether it works for other consecutive numbers too. 2 3 2 2+3 3 2 5 3 Numbers that are next to each other on the number line are called consecutive numbers.Read More
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