Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 500 + 80 + _____ = 581
- 3000 + _____ + 20 = 3620
- _____ + 60 + 8 = 7068
- 20000 + _____ + 8 = 26408
(a)
500 + 80 + _____ = 581
580 + _____ = 581
581 - 580 = 1
(b)
3000 + _____ + 20 = 3620
3020+ _____ = 3620
3620 - 3020 = 600
(c)
_____ + 60 + 8 = 7068
_____ + 68 = 7068
7068 - 68 = 7000
(d)
20000 + _____ + 8 = 26408
20008 + _____ = 26408
26408 - 20008 = 6400
Answer(s): 1, 600, 7000, 6400