PSLE
Round off the numbers to nearest ten and find the closest estimate of 27.8 x 15.6?
1 m
Find the area of this semicircle. Round off the answer to nearest 2 decimal place. (Take π = 3.14)
1 m
TRY FOR FREE
Find the following values without a calculator.
Round off 9.8765 to
  1. the nearest whole number.
  2. 1 decimal place.
  3. 2 decimal place.
  4. 3 decimal place.
1 m
Wendy's father's weight to her weight is 8 : 3. If Wendy puts on 60% more weight, by what percentage must her father's weight be reduced by so that their total weight remains unchanged as before. Correct the answer(s) to 1 decimal place.
2 m
A rectangle is placed in a circle with O as the centre. Use the calculator value of π to find the shaded part of the circle. Correct the answer to 1 decimal place.
2 m
Lisa's and Natalie's savings were in the ratio of 4 : 9. Both of them shared the cost of their grandfather's gift equally. Lisa's remaining savings was 14 as much as Natalie's savings. What percentage of her savings did Lisa spend? Correct the answer(s) to 1 decimal place.
3 m
One avocado cost 4 times as much as one honeydew. Mrs Zhang bought 2 avocados and 4 honeydews for $15. How much would 20 avocados and 16 honeydews cost? Express the answers to 2 decimal places.
3 m
9 identical 4-cm cubes are placed in an empty rectangular tank of length 90 cm and width 25 cm. The tank is then filled with water from a tap flowing at a rate of 7 litres per minute. It takes 12 minutes to fill up 34 of the tank. What is the height of the tank? Correct the answer to 1 decimal place.
3 m
Figure 1 shows a closed rectangular tank of dimensions 40 cm by 40 cm by 80 cm with a cube of edge 20 cm glued to Its bottom left corner. Tank contains 70 litres of water. Figure 2 shows the same rectangular tank lying on its side. Find the height of the water level, in centimetres, corrected to 2 decimal places.
3 m
A rectangular tank measuring 60 cm by 50 cm by 25 cm was to be filled with water by two taps, A and B. Tap A which fills the tank at a rate of 8ℓ per minute was first turned on for 5 minutes before Tap B was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap A was first turned on, what is the rate at which Tap B fills the tank? Give the answer in ℓ per minute correct to 1 decimal place.
3 m