Question 3 of 36beginner🔧 ApplyNumerical6 marks
Add the following numbers. Wherever possible, find easier ways to add the pairs of numbers.
(1)
15 + 79
Answer
94
(2)
46 + 99
Answer
145
(3)
38 + 35
Answer
73
(4)
5 + 89
Answer
94
(5)
76 + 28
Answer
104
(6)
69 + 20
Answer
89
Explanation
(1) 15 + 79 = 94. Adding ones: 5 + 9 = 14, write 4 carry 1. Tens: 1 + 7 + 1 = 9. (2) 46 + 99 = 46 + 100 - 1 = 145. Or direct: 6 + 9 = 15, write 5 carry 1. 4 + 9 + 1 = 14. (3) 38 + 35 = 73. Ones: 8 + 5 = 13, write 3 carry 1. Tens: 3 + 3 + 1 = 7. (4) 5 + 89 = 94. Ones: 5 + 9 = 14, write 4 carry 1. Tens: 0 + 8 + 1 = 9. (5) 76 + 28 = 104. Ones: 6 + 8 = 14, write 4 carry 1. Tens: 7 + 2 + 1 = 10. (6) 69 + 20 = 89. Ones: 9 + 0 = 9. Tens: 6 + 2 = 8.