Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 100 + 10 + _____ = 112
- 3000 + _____ + 30 = 3130
- _____ + 20 + 3 = 3023
- 30000 + _____ + 9 = 31409
(a)
100 + 10 + _____ = 112
110 + _____ = 112
112 - 110 = 2
(b)
3000 + _____ + 30 = 3130
3030+ _____ = 3130
3130 - 3030 = 100
(c)
_____ + 20 + 3 = 3023
_____ + 23 = 3023
3023 - 23 = 3000
(d)
30000 + _____ + 9 = 31409
30009 + _____ = 31409
31409 - 30009 = 1400
Answer(s): 2, 100, 3000, 1400