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Riddle puzzle: Adding and subtracting decimals

Solve each question. Find your answer in the decoder and write its letter in the box. The letters answer the riddle.

Name

Date

What did the triangle say to the circle?

  1. 1.Work out 413.36 + 6.933.
  2. 2.97.6 + 79.38 = ?
  3. 3.10.73 − 5.5 = ?
  4. 4.8.35 − 4.9 = ?
  5. 5.18 − 15.3 = ?
  6. 6.23.8 + 9.684 = ?
  7. 7.16 − 4.73 = ?
  8. 8.67.3 + 84.38 = ?
  9. 9.Work out 895.63 + 3.395.
  10. 10.46.4 + 84.3 = ?
  11. 11.Work out 156.69 + 1.661.
  12. 12.6.00 − 2.2 = ?
  13. 13.4.69 − 3.2 = ?
  14. 14.Work out 795.03 + 7.839.

Decoder

151.68I

0.78Q

83.043X

11.27O

158.351L

54.612J

3.8E

1.49S

33.484P

176.98O

802.869S

420.293Y

130.7T

5.23U

2.7E

23.013Z

899.025N

3.45R

The answer to the riddle

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Answer key: Adding and subtracting decimals riddle

What did the triangle say to the circle? You're pointless!

  1. 1. 420.293 = Y
  2. 2. 176.98 = O
  3. 3. 5.23 = U
  4. 4. 3.45 = R
  5. 5. 2.7 = E
  6. 6. 33.484 = P
  7. 7. 11.27 = O
  8. 8. 151.68 = I
  9. 9. 899.025 = N
  10. 10. 130.7 = T
  11. 11. 158.351 = L
  12. 12. 3.8 = E
  13. 13. 1.49 = S
  14. 14. 802.869 = S

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