Master Mental Math: Addition and Subtraction for Year 4

Question 1

Solve: 35 + 27

Accepted Answer

59

Answer

52

Answer

62

Answer

65

Question 2

A farmer initially has 45 sheep. He buys 28 more and then sells 17 sheep. How many sheep does he have left? (Use mental addition and subtraction.)

Accepted Answer

56

Answer

46

Answer

66

Answer

76

Question 3

Find the sum of 125 and 234.

Accepted Answer

359

Answer

349

Answer

369

Question 4

Which of the following is a strategy for mental subtraction?

Accepted Answer

Counting down

Answer

Counting up

Answer

Adding up

Question 5

To subtract 58 from 147 in your head, you could split 147 into 100 and 47, then subtract 50 and 8. What is the answer?

Accepted Answer

89

Answer

99

Answer

79

Answer

109

Question 6

A farmer has 32 sheep. He buys 15 more sheep. How many sheep does he have now?

Accepted Answer

47

Answer

17

Answer

37

Answer

57

Question 7

Add 45 and 27 in your head.

Accepted Answer

72

Answer

62

Answer

82

Answer

92

Question 8

Use the make-10 method to add 53 and 27 in your head.

Accepted Answer

80

Answer

70

Answer

90

Answer

100

Question 9

Use the 'make ten' method to subtract 14 from 46.

Accepted Answer

32

Answer

22

Answer

42

Answer

52

Question 10

What is the sum of 125 and 73?

Accepted Answer

198

Answer

192

Answer

200

Answer

208

Question 11

Which of the following is NOT a step in the compensation method for subtraction?

Accepted Answer

Ignore the decimal point

Answer

Adjust the numbers to make them easier to subtract

Answer

Subtract the smaller number from the larger number

Answer

Adjust the result by adding or subtracting the amount you compensated

Question 12

What is 100 plus 25?

Accepted Answer

125

Answer

115

Answer

135

Answer

145

Question 13

What is the difference between 98 and 32?

Accepted Answer

76

Answer

56

Answer

66

Answer

86

Question 14

Which of these equations shows the mental subtraction of 42 from 115?

Accepted Answer

115 - 42

Answer

42 - 115

Answer

115 + 42

Answer

115 / 42

Question 15

Find the sum of 45 and 26 using mental addition:

Accepted Answer

71

Answer

61

Answer

51

Question 16

Subtract 29 from 73 using mental subtraction:

Accepted Answer

54

Answer

44

Answer

34

Question 17

I have 42 marbles. I give 15 marbles to my sister and 10 marbles to my brother. How many marbles do I have remaining?

Accepted Answer

27

Answer

17

Answer

37

Question 18

A farmer has 24 sheep and 18 cows. How many animals does he have in total?

Accepted Answer

42

Answer

32

Answer

52

Question 19

A farmer has 67 cows and sells 24 of them. How many cows does he have now?

Accepted Answer

43

Answer

49

Answer

55

Answer

61

Question 20

Calculate the sum of 234 and 156 mentally:

Accepted Answer

390

Answer

590

Answer

490

Answer

290

Question 21

A shop has 124 pencils. They receive a delivery of 87 more pencils. How many pencils do they have altogether?

Accepted Answer

211

Answer

111

Answer

311

Answer

201

Question 22

Which method can you use to mentally add two 2-digit numbers?

Accepted Answer

Break each number into tens and ones, then add the tens and ones separately

Answer

Multiply the two numbers together

Answer

Add the two numbers directly, without breaking them down

Question 23

What is the difference between 543 and 278?

Accepted Answer

265

Answer

285

Answer

255

Answer

275