Rounding
Round 248.67 to the nearest ten.
What is 250?
Write 0.00456 to 2 significant figures.
What is 0.0046?
Round 23.678 to 1 decimal place.
What is 23.7?
The lower bound of 6.5 rounded to 1 decimal place.
What is 6.45?
A rectangular garden is measured to be 8.2 m long and 4.6 m wide, both to the nearest 0.1 m.
Work out the maximum possible area of the garden.
Max length = 8.25, Max width = 4.65
Max area = 8.25 × 4.65 = 38.3625 m²
This is the result of rounding 9.876 to 1 decimal place.
What is 9.9?
The number of significant figures in 10200.0
What is 6?
This is the result of rounding 5.449 to 2 decimal places.
What is 5.45?
The upper bound of 3.76 to 2 decimal places.
What is 3.765?
A square tile has a side of 15 cm, measured to the nearest cm.
What is the minimum possible area of the tile?
Min side = 14.5 cm
Min area = 14.5 × 14.5 = 210.25 cm²
Round 134.59 to the nearest whole number.
What is 135?
Round 3.1459 to 3 significant figures.
What is 3.15?
This number rounds to 7.9 when rounded to 1 decimal place. It is greater than 7.85.
What is any number between 7.85 and 7.949...
The lower and upper bounds of 40, rounded to the nearest 10.
What are 35 and 44.999...?
The length of a plank is measured as 2.5 m, correct to the nearest 0.1 m.
It is used to build 4 shelves of equal length.
What is the maximum possible length of each shelf?
Min length = 2.45 m (less wood available)
2.45 ÷ 4 = 0.6125 m
This number, when rounded to the nearest hundred, becomes 700.
What is any number from 650 to 749?
This number, when rounded to 1 significant figure, becomes 5000.
What is any number from 4500 to 5499?
The smallest number that rounds to 8.3 when rounded to 1 decimal place.
What is 8.25?
If a length is measured as 12.0 cm to 1 decimal place, its lower bound is this.What is 11.95 cm?
What is 11.95 cm?
A car travels 65 km in 1.2 hours.
Both measurements are rounded to the nearest km and nearest 0.1 hour.
Calculate the minimum possible average speed of the car.
Min speed = Min distance / Max time = 64.5 ÷ 1.25 = 51.6 km/h
This is the smallest number that rounds to 850 when rounded to the nearest ten.
What is 845?
The largest number that rounds to 6.70 when given to 3 significant figures.
What is 6.704?
Round 91.9865 to 3 decimal places.
What is 91.987?
A mass is 65 kg rounded to the nearest kg. What are its bounds?
What are 64.5 kg and 65.5 kg?
A metal rod is cut into 5 equal pieces.
The rod's length is 100 cm, measured to the nearest cm.
Find the minimum possible length of each piece.
Min length = 99.5 cm → 99.5 ÷ 5 = 19.9 cm