Answer:
Smaller is 18 and larger be 30
Step-by-step explanation:
Yes he is correct because if you do the algorithm, 0+3=3 and 20+40=60 and 60+3=63. There is no regrouping needed.
Each pound costs 2.40,
to check this 2.40 * 5 = 12
so 2.40 * 7 = 16.80
Answer: 16.80

Rationalize.

This can be further simplified to the decimal:
-0.43006...
I hope this helps :)
480 or 500 depending on if you want to round to the nearest 10 or the nearest 100