Checking by estimating | Maths | Quizalize & Oak National Academy

Starter quiz

Significant figures are the digits in a number that contribute to the accuracy of the number. The first significant figure is the first __________ digit.
- digit between 5 and 9
- important
- non-zero ✓
- zero
Which of the following are good estimate calculations for 989 × 213.4?
- 1000 × 200 ✓
- 1000 × 210 ✓
- 1000 × 213 ✓
- 9 × 2
Which of the following are good, quick estimate calculations for 432.4 ÷ 1.85?
- 400 ÷ 2 ✓
- 400 ÷ 1.85
- 500 ÷ 2 ✓
- 5 ÷ 2
Which of the following are correct estimates for ${17.9}\over {0.532}$ ?
- ${18}\over {0.5}$ $= 9$
- ${20}\over {0.5}$ $= 10$
- ${18}\over {0.5}$ $= 36$ ✓
- ${20}\over {0.5}$ $= 40$ ✓
Which of the following is the correct estimate for ${3.4\times3.92}\over {0.511}$ ?
- ${3\times4}\over {0.5}$ $= 12$
- ${3\times4}\over {0.5}$ $= 24$ ✓
- ${3\times4}\over {0.5}$ $= 6$
- ${3.4\times3.92}\over {0.511}$ $= 26.082$
Horses and ponies are measured using ‘hands’ as a unit, where the width of the hand is used. This pony has a height of 9 hands. Estimate the height of the pony.
- 200 cm
- 150 cm
- 90 cm ✓
- 50 cm
- 10 cm