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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 631 · 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. 1.65² =
  2. 2.47² =
  3. 3.34² =
  4. 4.45² =
  5. 5.95² =
  6. 6.51² =
  7. 7.35² =
  8. 8.37² =
  9. 9.75² =
  10. 10.31² =
  11. 11.78² =
  12. 12.49² =
  13. 13.56² =
  14. 14.77² =
  15. 15.63² =
  16. 16.39² =
  17. 17.42² =
  18. 18.89² =
  19. 19.76² =
  20. 20.67² =
  21. 21.32² =
  22. 22.62² =
  23. 23.53² =
  24. 24.44² =
  25. 25.55² =
  26. 26.98² =
  27. 27.87² =
  28. 28.91² =
  29. 29.33² =
  30. 30.43² =
  31. 31.73² =
  32. 32.46² =
  33. 33.85² =
  34. 34.54² =
  35. 35.79² =
  36. 36.82² =
  37. 37.81² =
  38. 38.57² =
  39. 39.72² =
  40. 40.38² =

Answer key

  1. 4225
  2. 2209
  3. 1156
  4. 2025
  5. 9025
  6. 2601
  7. 1225
  8. 1369
  9. 5625
  10. 961
  11. 6084
  12. 2401
  13. 3136
  14. 5929
  15. 3969
  16. 1521
  17. 1764
  18. 7921
  19. 5776
  20. 4489
  21. 1024
  22. 3844
  23. 2809
  24. 1936
  25. 3025
  26. 9604
  27. 7569
  28. 8281
  29. 1089
  30. 1849
  31. 5329
  32. 2116
  33. 7225
  34. 2916
  35. 6241
  36. 6724
  37. 6561
  38. 3249
  39. 5184
  40. 1444

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