Level 1
Find the following values without a calculator.
  1. 23 = ?9
  2. 45 = 20?
  3. 812 = ?6
  4. 915 = 12?
2 m
Level 2
What is the missing number?
?15 = 1218
2 m
Level 2
How many eighths must be added to 134 to make 3?
2 m