Checkpoint: in between, cubes and cube roots

A square patch has an area of 50 square units. Between which two whole numbers does its side sit?

• Nothing can be said about it
• Between 5 and 6, because 50 is close to 55
• Between 7 and 8

A crate is 5 blocks along every edge and packed full. How many blocks does it hold?

• 15, because 5 × 3 = 15
• 125
• 25, because that is 5 rows of 5

7 + 9 + 11 is the third group of odd numbers. What does it add up to?

• 9, because 3 × 3 = 9
• 27
• 18, because 3 × 6 = 18

216 is 2 × 2 × 2 × 3 × 3 × 3. What is its cube root?

• 6
• 5, because 2 + 3 = 5
• 36, because 216 shared into 6 is 36

A square courtyard is 9 metres a side. It is paved with square metre slabs. How many slabs are needed?

• 729, because 9 × 9 × 9 = 729
• 81
• 36, because the four sides come to 36 metres