Level 1
Estimate the product of 35972 and 63 by first rounding off the bigger number to the nearest thousand and the smaller number to the nearest ten.
Level 3
A tank, 110 cm by 100 cm by 70 cm, was completely filled with water. It was used to fill 16 bottles, each 3 litres in capacity. What was the height of the water left in the tank after all the bottles were filled. Round off to whole number.