Approximation and Errors
Hong Kong
Stage 1 - Stage 3
Check reasonableness of calculations
Interactive practice questions
Ursula collects beetles. She knows that she has exactly $169$169 of them. Ursula has to move house this week, and must buy storage boxes to transport all of them.
Which of the following should Ursula buy?
$3$3 boxes that hold $180$180 beetles each.
A
$4$4 boxes that hold $40$40 beetles each.
B
$2$2 boxes that hold $10$10 beetles each.
C
$9$9 boxes that hold $20$20 beetles each.
D
Easy
< 1min
Brad and Bill went out one evening. Bill said:
"I have $\$18.40$$18.40, which is about $\$20$$20. This food stall charges $\$9.50$$9.50 for a kebab, which is about $\$10$$10. That means I have enough money to pay for both of us to get a kebab."
Easy
< 1min
Which of the following is closest to the sum $33+42+24$33+42+24?
Easy
< 1min
Is the following sum close to $1000$1000?
$947+826+12$947+826+12
Easy
< 1min
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