Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 78 ones = _____
- 8 tens = _____
- 2 tens 8 ones = _____
- 8 tens 11 ones = _____
(a)
78 ones
= 78 x 1
= 78
(b)
8 tens
= 8 x 10
= 80
(c)
2 tens 8 ones
= 2 x 10 + 8 x 1
= 20 + 8
= 28
(d)
8 tens 11 ones
= 8 x 10 + 11 x 1
= 80 + 11
= 91
Answer(s): 78, 80, 28, 91