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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 575 · 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. 1.41² =
  2. 2.62² =
  3. 3.54² =
  4. 4.71² =
  5. 5.81² =
  6. 6.57² =
  7. 7.83² =
  8. 8.73² =
  9. 9.76² =
  10. 10.88² =
  11. 11.87² =
  12. 12.72² =
  13. 13.51² =
  14. 14.86² =
  15. 15.94² =
  16. 16.34² =
  17. 17.61² =
  18. 18.82² =
  19. 19.56² =
  20. 20.93² =
  21. 21.92² =
  22. 22.44² =
  23. 23.75² =
  24. 24.33² =
  25. 25.46² =
  26. 26.85² =
  27. 27.78² =
  28. 28.69² =
  29. 29.66² =
  30. 30.58² =
  31. 31.43² =
  32. 32.95² =
  33. 33.42² =
  34. 34.35² =
  35. 35.65² =
  36. 36.67² =
  37. 37.47² =
  38. 38.63² =
  39. 39.96² =
  40. 40.32² =

Answer key

  1. 1681
  2. 3844
  3. 2916
  4. 5041
  5. 6561
  6. 3249
  7. 6889
  8. 5329
  9. 5776
  10. 7744
  11. 7569
  12. 5184
  13. 2601
  14. 7396
  15. 8836
  16. 1156
  17. 3721
  18. 6724
  19. 3136
  20. 8649
  21. 8464
  22. 1936
  23. 5625
  24. 1089
  25. 2116
  26. 7225
  27. 6084
  28. 4761
  29. 4356
  30. 3364
  31. 1849
  32. 9025
  33. 1764
  34. 1225
  35. 4225
  36. 4489
  37. 2209
  38. 3969
  39. 9216
  40. 1024

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