Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 100 + 60 + _____ = 161
- 9000 + _____ + 40 = 9740
- _____ + 40 + 4 = 6044
- 60000 + _____ + 2 = 61402
(a)
100 + 60 + _____ = 161
160 + _____ = 161
161 - 160 = 1
(b)
9000 + _____ + 40 = 9740
9040+ _____ = 9740
9740 - 9040 = 700
(c)
_____ + 40 + 4 = 6044
_____ + 44 = 6044
6044 - 44 = 6000
(d)
60000 + _____ + 2 = 61402
60002 + _____ = 61402
61402 - 60002 = 1400
Answer(s): 1, 700, 6000, 1400