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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 670 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.99² =
  2. 2.73² =
  3. 3.35² =
  4. 4.75² =
  5. 5.42² =
  6. 6.51² =
  7. 7.47² =
  8. 8.43² =
  9. 9.44² =
  10. 10.48² =
  11. 11.46² =
  12. 12.89² =
  13. 13.54² =
  14. 14.33² =
  15. 15.71² =
  16. 16.49² =
  17. 17.62² =
  18. 18.98² =
  19. 19.37² =
  20. 20.69² =
  21. 21.96² =
  22. 22.97² =
  23. 23.32² =
  24. 24.77² =
  25. 25.66² =
  26. 26.95² =
  27. 27.39² =
  28. 28.52² =
  29. 29.93² =
  30. 30.92² =
  31. 31.85² =
  32. 32.57² =
  33. 33.36² =
  34. 34.79² =
  35. 35.58² =
  36. 36.45² =
  37. 37.65² =
  38. 38.81² =
  39. 39.53² =
  40. 40.34² =

Answer key

  1. 9801
  2. 5329
  3. 1225
  4. 5625
  5. 1764
  6. 2601
  7. 2209
  8. 1849
  9. 1936
  10. 2304
  11. 2116
  12. 7921
  13. 2916
  14. 1089
  15. 5041
  16. 2401
  17. 3844
  18. 9604
  19. 1369
  20. 4761
  21. 9216
  22. 9409
  23. 1024
  24. 5929
  25. 4356
  26. 9025
  27. 1521
  28. 2704
  29. 8649
  30. 8464
  31. 7225
  32. 3249
  33. 1296
  34. 6241
  35. 3364
  36. 2025
  37. 4225
  38. 6561
  39. 2809
  40. 1156

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