Question

Mark (✓) against the correct answer
What should be subtracted from .1 to get .03?

(a) .7
(b) .07
(c) .007
(d) none of these

Answer 1

(b) .07

We have:
0.1 − x = 0.03
⇒ x = 0.1 − 0.03

Converting the given decimals into like decimals, we get:
0.10 and 0.03

Writing them in column form with the larger one at the top and subtracting, we get:

∴ x = 0.07
Hence, the required number is 0.07.