420
1 square eter = 10.7639 square feet (rounded) 417 square eter = 4,488.55 square feet (rounded)
It is then 740 when rounded to the nearest ten.
It is 420
It is 2350 when rounded to the nearest ten
30.089 rounded to the nearest ten is 30.
27.4 rounded to the nearest ten is 30.
60
2602 rounded to the nearest ten is 2600.
320
20
260