Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 27 ones = _____
- 9 tens = _____
- 2 tens 1 ones = _____
- 7 tens 20 ones = _____
(a)
27 ones
= 27 x 1
= 27
(b)
9 tens
= 9 x 10
= 90
(c)
2 tens 1 ones
= 2 x 10 + 1 x 1
= 20 + 1
= 21
(d)
7 tens 20 ones
= 7 x 10 + 20 x 1
= 70 + 20
= 90
Answer(s): 27, 90, 21, 90