Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 300 - 70 + 700 = _______
- 839 = 500 + _______ + 80
- 8288 = 8000 + _______ + 8
- 7954 = 7050 + _______
(a)
300 - 70 + 700
= 300 + 700 - 70
= 1000 - 70
= 930
(b)
839 = 500 + ______ + 80
839 = 500 + 80 + ______
839 = 580 + ______
839 - 580 = 259
(c)
8288 = 8000 + ______ + 8
8288 = 8000 + 8 + ______
8288 = 8008 + ______
8288 - 8008 = 280
(d)
7954 = 7050 + ______
7954 - 7050 = 904
Answer(s): 930, 259, 280, 904