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.
Level 1 · Warm-up
1 Solve 2x + 3 = 11. Type the number only.
Show worked solution
Subtract 3 to get 2x = 8, then divide by 2: x = 4.
2 Solve 3y + 1 = 16. Type the number only.
Show worked solution
Subtract 1 to get 3y = 15, then divide by 3: y = 5.
3 In 4x + 7 = 27, what is 4x equal to after the first step? Type the number only.
Show worked solution
27 − 7 = 20, so 4x = 20.
Level 2 · Core
4 Solve 5a − 4 = 21. Type the number only.
Show worked solution
Add 4 to get 5a = 25, then divide by 5: a = 5.
5 Solve 6k + 8 = 50. Type the number only.
Show worked solution
Subtract 8 to get 6k = 42, then divide by 6: k = 7.
6 Solve 2m − 9 = 5. Type the number only.
Show worked solution
Add 9 to get 2m = 14, then divide by 2: m = 7.
Level 3 · Challenge
7 Solve 4x + 6 = 24. Type the answer, which may be a decimal.
Show worked solution
Subtract 6 to get 4x = 18, then divide by 4: x = 4.5.
8 A plumber charges $60 call-out plus $45 per hour. The bill was $195. How many hours? Type the number only.
Show worked solution
45h + 60 = 195, so 45h = 135 and h = 3 hours.
9 I think of a number, multiply by 3 and subtract 7, and get 20. What was the number? Type the number only.
Show worked solution
3n − 7 = 20, so 3n = 27 and n = 9.