1. EASY

Round 24 to the nearest 10.

 
2. EASY

Round 40 to the nearest 10.

 
3. EASY

Round 148 to the nearest 10.

 
4. EASY

Round 72 to the nearest 10.

 
5. MEDIUM

Add 16 to 32, then round your answer to the nearest 10.

 
6. MEDIUM

Round 35 to the nearest 10.

 
7. MEDIUM

What digit must every number that is rounded to the nearest 10 end with?

 
8. HARD

Ms. Steinar assigned Jack a two-digit even number. Jack rounded his number to the nearest 10, added the result to 12, and rounded the sum again to the nearest 10. If the final number is 50, which of the following CANNOT be Jack's original number?

  1. 34
  2. 36
  3. 38
  4. 40
  5. 42
 
9. HARD

John rounds 48 to the nearest ten, then rounds 54 to the nearest ten, then adds his two numbers together. Jean adds 48 and 54, then rounds the result. Who's final number is bigger, John's or Jean's?

  1. John
  2. Jean
  3. Their numbers are equal
  4. Impossible to determine
  5. None of the above
 
10. HARD

Jack rounds 27 to the nearest 10, then rounds 35 to the nearest 10, then adds the two numbers. Jacques adds 27 and 35, then rounds the sum to the nearest 10. Who's final number is bigger, Jack's or Jacques's?

  1. Jack
  2. Jacques
  3. Their numbers are equal
  4. Impossible to determine
  5. None of the above