Answer:
2563
a) nearest 10 grams -- round the tens place
i. 63 → 60
ii. 2560 g
b) nearest 100 grams -- round the hundreds place
i. 563 → 600
ii. 2600 g
c) nearest kilograms -- convert grams to kilograms & round
i. 2563 → kilograms = "decimal hop" 3 places to the left → 2.563
ii. 2.563 → 3
iii. 3 kg