In the number 129 800, how many times of the value of ‘8’ is that of ‘2’?
What is the result of multiplying the largest 2-digit number and the smallest 3-digit odd number?
Each bus can carry 45 passengers. How many buses are needed at least for carrying 597 passengers?
What is the result of adding up all the factors of 33?
What is the difference between the smallest and the greatest multiples of 14 between 60 and 170?
After mother gave Sandy $60 as pocket money, Sandy spent $42.6 on buying a pack of snacks and had $33.8 left. How much did Sandy have before mother gave her pocket money?
The tens digit and tenths digit of a number are ‘4’ and ‘7’ respectively. Which of the following may be this number?
Mr Cheung used the mobile phone to have calls for 20 minutes on each of the past 24 days. If the fee of calls was $0.16 per minute, how much should he pay?
A cat weighs 3.24 kg. The weight of a dog is 2.5 times that of the cat. By how much is the dog heavier than the cat?
The hexagonal prism is formed by 18 sticks of the same length and 12 plastic beads. This hexagonal prism is restructured to form three quadrilateral pyramids. How many extra sticks and plastic beads are needed at least?