Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 423 + 1 = ______
- 21 + 31 = _____
- 538 + 420 = _____
- 2775 + 210 = _____
(a)
423 + 1 = 424
(b)
21 + 31 = 52
(c)
538 + 420 = 958
(d)
2775 + 210 = 2985
Answer(s): 424, 52, 958, 2985