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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 4 · 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. 1.88² =
  2. 2.86² =
  3. 3.83² =
  4. 4.61² =
  5. 5.81² =
  6. 6.35² =
  7. 7.55² =
  8. 8.71² =
  9. 9.53² =
  10. 10.75² =
  11. 11.43² =
  12. 12.51² =
  13. 13.91² =
  14. 14.48² =
  15. 15.37² =
  16. 16.87² =
  17. 17.89² =
  18. 18.47² =
  19. 19.85² =
  20. 20.79² =
  21. 21.69² =
  22. 22.66² =
  23. 23.63² =
  24. 24.49² =
  25. 25.76² =
  26. 26.64² =
  27. 27.94² =
  28. 28.65² =
  29. 29.54² =
  30. 30.44² =
  31. 31.74² =
  32. 32.42² =
  33. 33.57² =
  34. 34.97² =
  35. 35.84² =
  36. 36.96² =
  37. 37.33² =
  38. 38.77² =
  39. 39.72² =
  40. 40.34² =

Answer key

  1. 7744
  2. 7396
  3. 6889
  4. 3721
  5. 6561
  6. 1225
  7. 3025
  8. 5041
  9. 2809
  10. 5625
  11. 1849
  12. 2601
  13. 8281
  14. 2304
  15. 1369
  16. 7569
  17. 7921
  18. 2209
  19. 7225
  20. 6241
  21. 4761
  22. 4356
  23. 3969
  24. 2401
  25. 5776
  26. 4096
  27. 8836
  28. 4225
  29. 2916
  30. 1936
  31. 5476
  32. 1764
  33. 3249
  34. 9409
  35. 7056
  36. 9216
  37. 1089
  38. 5929
  39. 5184
  40. 1156

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