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.
$4$4 boxes that hold $40$40 beetles each.
$2$2 boxes that hold $10$10 beetles each.
$9$9 boxes that hold $20$20 beetles each.
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."
Which of the following is closest to the sum $33+42+24$33+42+24?
Is the following sum close to $1000$1000?
$947+826+12$947+826+12
Outcomes
NA6-6
Generalise the properties of operations with rational numbers, including the properties of exponents
91027
Apply algebraic procedures in solving problems