Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 300 - 30 + 900 = _______
- 843 = 500 + _______ + 90
- 7472 = 7000 + _______ + 2
- 2232 = 2030 + _______
(a)
300 - 30 + 900
= 300 + 900 - 30
= 1200 - 30
= 1170
(b)
843 = 500 + ______ + 90
843 = 500 + 90 + ______
843 = 590 + ______
843 - 590 = 253
(c)
7472 = 7000 + ______ + 2
7472 = 7000 + 2 + ______
7472 = 7002 + ______
7472 - 7002 = 470
(d)
2232 = 2030 + ______
2232 - 2030 = 202
Answer(s): 1170, 253, 470, 202