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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 715 · 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. 1.55² =
  2. 2.94² =
  3. 3.49² =
  4. 4.54² =
  5. 5.46² =
  6. 6.68² =
  7. 7.76² =
  8. 8.64² =
  9. 9.91² =
  10. 10.93² =
  11. 11.42² =
  12. 12.75² =
  13. 13.58² =
  14. 14.61² =
  15. 15.38² =
  16. 16.57² =
  17. 17.92² =
  18. 18.45² =
  19. 19.47² =
  20. 20.41² =
  21. 21.53² =
  22. 22.86² =
  23. 23.33² =
  24. 24.84² =
  25. 25.72² =
  26. 26.44² =
  27. 27.65² =
  28. 28.51² =
  29. 29.89² =
  30. 30.79² =
  31. 31.81² =
  32. 32.35² =
  33. 33.36² =
  34. 34.98² =
  35. 35.78² =
  36. 36.56² =
  37. 37.73² =
  38. 38.67² =
  39. 39.39² =
  40. 40.62² =

Answer key

  1. 3025
  2. 8836
  3. 2401
  4. 2916
  5. 2116
  6. 4624
  7. 5776
  8. 4096
  9. 8281
  10. 8649
  11. 1764
  12. 5625
  13. 3364
  14. 3721
  15. 1444
  16. 3249
  17. 8464
  18. 2025
  19. 2209
  20. 1681
  21. 2809
  22. 7396
  23. 1089
  24. 7056
  25. 5184
  26. 1936
  27. 4225
  28. 2601
  29. 7921
  30. 6241
  31. 6561
  32. 1225
  33. 1296
  34. 9604
  35. 6084
  36. 3136
  37. 5329
  38. 4489
  39. 1521
  40. 3844

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