Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 300 + 80 + _____ = 389
- 4000 + _____ + 90 = 4190
- _____ + 70 + 8 = 3078
- 50000 + _____ + 4 = 55604
(a)
300 + 80 + _____ = 389
380 + _____ = 389
389 - 380 = 9
(b)
4000 + _____ + 90 = 4190
4090+ _____ = 4190
4190 - 4090 = 100
(c)
_____ + 70 + 8 = 3078
_____ + 78 = 3078
3078 - 78 = 3000
(d)
50000 + _____ + 4 = 55604
50004 + _____ = 55604
55604 - 50004 = 5600
Answer(s): 9, 100, 3000, 5600