Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 100 + 20 + _____ = 124
- 5000 + _____ + 80 = 5780
- _____ + 30 + 2 = 1032
- 10000 + _____ + 4 = 19604
(a)
100 + 20 + _____ = 124
120 + _____ = 124
124 - 120 = 4
(b)
5000 + _____ + 80 = 5780
5080+ _____ = 5780
5780 - 5080 = 700
(c)
_____ + 30 + 2 = 1032
_____ + 32 = 1032
1032 - 32 = 1000
(d)
10000 + _____ + 4 = 19604
10004 + _____ = 19604
19604 - 10004 = 9600
Answer(s): 4, 700, 1000, 9600