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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 191 · 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. 1.45² =
  2. 2.46² =
  3. 3.72² =
  4. 4.74² =
  5. 5.78² =
  6. 6.92² =
  7. 7.49² =
  8. 8.82² =
  9. 9.75² =
  10. 10.64² =
  11. 11.76² =
  12. 12.33² =
  13. 13.81² =
  14. 14.87² =
  15. 15.58² =
  16. 16.56² =
  17. 17.31² =
  18. 18.48² =
  19. 19.68² =
  20. 20.36² =
  21. 21.69² =
  22. 22.59² =
  23. 23.65² =
  24. 24.42² =
  25. 25.63² =
  26. 26.61² =
  27. 27.53² =
  28. 28.41² =
  29. 29.73² =
  30. 30.52² =
  31. 31.62² =
  32. 32.38² =
  33. 33.34² =
  34. 34.89² =
  35. 35.54² =
  36. 36.79² =
  37. 37.55² =
  38. 38.66² =
  39. 39.88² =
  40. 40.93² =

Answer key

  1. 2025
  2. 2116
  3. 5184
  4. 5476
  5. 6084
  6. 8464
  7. 2401
  8. 6724
  9. 5625
  10. 4096
  11. 5776
  12. 1089
  13. 6561
  14. 7569
  15. 3364
  16. 3136
  17. 961
  18. 2304
  19. 4624
  20. 1296
  21. 4761
  22. 3481
  23. 4225
  24. 1764
  25. 3969
  26. 3721
  27. 2809
  28. 1681
  29. 5329
  30. 2704
  31. 3844
  32. 1444
  33. 1156
  34. 7921
  35. 2916
  36. 6241
  37. 3025
  38. 4356
  39. 7744
  40. 8649

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