Answer:

(a) We will start from 34. To find 10 less than 34, we will go 10 steps back or jump down one row. When we jump 1 row down, we reach 24. A jump from 34 to 24 is like taking 10 steps backwards from 34. We can write it like this: 34 − 10 = 24 Thus, 10 less than 34 is 24.

(b) We will start from 53. To subtract 20 from 53, we will jump 2 rows down. When we jump 2 rows down, we reach 33. A jump from 53 to 33 is like taking 20 steps backwards from 53. We can write it like this: 53 − 20 = 33

(c) We will start from 31. To find 11 more than 31, we will jump 1 row up from 31 and take 1 step right to reach 42. This is like taking 11 steps forward from 31. We can write it like this: 31 + 10 = 41 41 +1 = 42 Thus, 11 more than 31 is 42.

(d)​ We will start from 66. To find 11 less than 66, we will jump 1 row down from 66 and take 1 step left to reach 55. This is like taking 11 steps backwards from 66. We can write it like this: 66 ​ − 10 = 56 56 ​ − 1 = 55 Thus, 11 less than 66 is 55.

(e) We will start from 62. To add 13 to 62, we will jump 1 row up from 62 and take 3 steps right to reach 75. This is like taking 13 steps forward from 62. We can write it like this: 62 + 10 = 72 72 + 3 = 75 Thus, 62 + 13 = 75

(f) We will start from 89. To find 23 less than 66, we will jump 2 rows down from 89 and take 3 steps left to reach 66. This is like taking 23 steps backwards from 89. We can write it like this: 89 ​− 20 = 69 69​ − 3 = 66 Thus, 23 less than 89 is 66.

(g) We will start from 10. To add 40 to 10, we can jump 4 rows up from 10. When we jump 4 rows up, we reach 50. A jump from 10 to 50 is like taking 40 steps forward from 10. We can write it like this: 10 + 40 = 50 Thus, 10 more than 40 is 50.

(h) We will start from 28. To add 9 to 28, we will jump 1 row up from 28 and take 1 step left to reach 37. This is like taking 9 steps forward from 28. We can write it like this: 28 + 10 = 38 38 ​− 1 = 37 Thus, 9 added to 28 gives 37.

(i) We will start from 44. To add 9 to 44, we will jump 1 row up from 44 and take 1 step left to reach 53. This is like taking 9 steps forward from 44. We can write it like this: 44 + 10 = 54 54 ​− 1 = 53 Thus, the sum of 9 and 44 is 53.

(j) We will start from 98. To reduce 98 by 34, we will jump 3 rows down from 98 and take 4 steps left to reach 64. This is like taking 34 steps backwards from 98. We can write it like this: 98 ​− 30 = 68 68 ​− 4 = 64 Thus, reducing 98 by 34 gives 64.

(k) We will start from 4. To add 37 to 4, we will jump 4 rows up from 4 and take 3 steps left to reach 41. This is like taking 37 steps forward from 4. We can write it like this: 4 + 40 = 44 44 ​− 3 = 41 Thus, 4 more than 37 is 41.

(l) We will start from 83. To take 35 from 83, we will jump 4 rows down and take 5 steps right to reach 48. This is like taking 35 steps backwards from 83. We can write it like this: 83 ​​− 40 = 43 43 + 5 = 48 Thus, by taking 35 away from 83, we get 48.

Answer:

(a) 37 + 9 = 46 Yes, there is a shortcut method to do this. We will first add 37 and 10 and then subtract 1 from the answer. 37 + 10 = 47 Now, 47 − 1 = 46

(b) We will first subtract 10 from 62. 62 − 10 = 52 We will now subtract 10 from 52. 52 − 10 = 42 We will finally subtract 10 from 42 to get 32 as the answer. 42 − 10 = 32 Thus, 62 − 30 = 32

(c) We know 46 + 20 = 66 We will add 8 to get the final answer. 66 + 8 = 74 So, 74 = 46 + 28

(d) We will first subtract 10 from 87. 87 − 10 = 77 We will now subtract 4 from 77 and get 73. So, 87 − 14 = 73

(e) We will first subtract 10 from 62. 62 − 10 = 52 We will now subtract 9 from 52. 52 − 9 = 43 So, 62 − 19 = 43

(f) 36 = 44 − 8

(g) We add 50 to 45. 45 + 50 = 95 On adding 4 to 95, we get 99. Now, 95 + 4 = 99 So, 45 + 54 = 99

(h) We will first add 30 to 43. 43 + 30 = 73 We will now add 1 to 73. 43 + 31 = 74

(i) We know 40 + 26 = 66 Now, we will add 9 to 66. 35 + 40 = 75

(j) 50 + 50 = 100

(k) We will subtract 1 from 2. 2 − 1 = 1

(l) We will first subtract 30 from 57. 57 − 30 = 27 We will now subtract 7 from 27. 57 − 37 = 20

Answer:

Answer:

33 + 42 =

7519 + 61 =

80   90= 48 + 42

60= 33 + 27

97= 34 + 63

117= 53 + 64

55 + 25 =

8067 + 25 =

9272 + 56 =

128

Answer:

Number of candles with Rafi = 153 Number of candles given by Paras to Rafi = 237 Total number of candles with Rafi = 237 + 153 = 390

Thus, Rafi has a total of 390 candles.

Answer:

Number of people in the first compartment = 132 Number of people in the second compartment = 129 Total number of people in both the compartments = 132 + 129 = 261 Thus, there are 261 people in both the compartments.

Answer:

Number of pebbles with Shanu = 138 Number of pebbles with Karim = 44 Total number of pebbles = 138 + 44 = 182

Thus, Shanu and Karim found 182 pebbles altogether.

Answer:

(a) Number of girls who like oranges = 136 Number of boys who like oranges = 128 Total number of students who like oranges = 136 + 128 = 264

(b) Number of girls who like mangoes = 240 Number of boys who like mangoes = 243 Total number of students who like mangoes = 240 + 243 = 483

(c) Total number of students in the school = 264 + 483 = 747

(d) Number of girls who like oranges = 136 Number of girls who like mangoes = 240 Total number of girls in the school = 136 + 240 = 376 Thus, the number of girls in the school is more than 350.

Answer:

A. (i)

(ii)

(iii)

(iv)

(v)

B. (i)

(ii)

(iii)

(iv)

(v)

Answer:

(a) 75 + 20 =

95(b) 90 + 60 =

150(c) 25 + 30 + 3 =

58(d) 9 + 40 + 31 =

80(e) 500 + 200 =

700(f) 400 + 350 =

750(g) 670 + 120 =

790(h) 380 + 210 =

590(i) 205 + 650 =

855(j) 128 + 600 =

728(k) 150 + 69 =

219(l) 37 + 46 + 3 =

86

Answer:

(a)

(b)