Find the following values without a calculator. Round off the following numbers to the nearest 10.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 79
- 421
- 509
- 4080
(a)
79 (=) 80
(b)
421 (=) 420
(c)
509 (=) 510
(d)
4080 (=) 4080
Answer(s): 80, 420, 510, 4080