Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 There are 12 counters and 7 are blue. How many are not blue?
Show worked solution
5 are not blue.
2 A bag has red, blue and green counters. Write how many colours are in the bag, and whether taking a white one is possible. Use 1 for yes and 0 for no.
Show worked solution
3 colours, and white is not one of them, so 0 — it is impossible.
3 Emma had 8 shells. She kept 5. How many did she give away?
Show worked solution
3 shells.
Level 2 · Core
4 Pencils come in packets of 10. A teacher needs 34 pencils. What is the least number of packets she needs?
Show worked solution
3 packets is 30, which is not enough for 34. 4 packets.
5 Cassie cut 5 oranges into quarters. Write how many quarters come from one orange, and how many quarters she has altogether.
Show worked solution
4 from each orange, and 5 × 4 = 20 altogether.
6 A box has 6 red, 10 blue and 4 yellow marbles. How many marbles are in the box altogether?
Show worked solution
20 marbles.
Level 3 · Challenge
7 A box has 6 red, 10 blue and 4 yellow marbles.1 Taking a white marble is impossible.
2 Blue is the most likely colour.
3 Taking a red marble is impossible.
Which statements are correct?
2 Blue is the most likely colour.
3 Taking a red marble is impossible.
Which statements are correct?
Show worked solution
There is no white (1 ✓) and blue has the most (2 ✓). There are 6 red marbles, so taking one is possible, not impossible (3 ✗). 1 and 2.
8 Biscuits come in packets of 10 and Shelley needs one for each of 27 classmates. Write the number of biscuits in 2 packets, and the least number of packets she needs.
Show worked solution
2 packets is 20 biscuits, which is not enough for 27, so she needs 3 packets.
9 There are 20 marbles in a box. 6 are red and 4 are yellow. How many are not red and not yellow?
Show worked solution
20 − 6 − 4 = 10.