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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 352 · 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. 1.42² =
  2. 2.71² =
  3. 3.74² =
  4. 4.51² =
  5. 5.81² =
  6. 6.97² =
  7. 7.63² =
  8. 8.47² =
  9. 9.95² =
  10. 10.84² =
  11. 11.88² =
  12. 12.45² =
  13. 13.32² =
  14. 14.54² =
  15. 15.49² =
  16. 16.94² =
  17. 17.66² =
  18. 18.73² =
  19. 19.69² =
  20. 20.34² =
  21. 21.96² =
  22. 22.48² =
  23. 23.65² =
  24. 24.44² =
  25. 25.31² =
  26. 26.41² =
  27. 27.67² =
  28. 28.79² =
  29. 29.92² =
  30. 30.86² =
  31. 31.46² =
  32. 32.36² =
  33. 33.35² =
  34. 34.85² =
  35. 35.77² =
  36. 36.75² =
  37. 37.33² =
  38. 38.53² =
  39. 39.39² =
  40. 40.82² =

Answer key

  1. 1764
  2. 5041
  3. 5476
  4. 2601
  5. 6561
  6. 9409
  7. 3969
  8. 2209
  9. 9025
  10. 7056
  11. 7744
  12. 2025
  13. 1024
  14. 2916
  15. 2401
  16. 8836
  17. 4356
  18. 5329
  19. 4761
  20. 1156
  21. 9216
  22. 2304
  23. 4225
  24. 1936
  25. 961
  26. 1681
  27. 4489
  28. 6241
  29. 8464
  30. 7396
  31. 2116
  32. 1296
  33. 1225
  34. 7225
  35. 5929
  36. 5625
  37. 1089
  38. 2809
  39. 1521
  40. 6724

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