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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 551 · 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. 1.42² =
  2. 2.74² =
  3. 3.51² =
  4. 4.44² =
  5. 5.75² =
  6. 6.38² =
  7. 7.45² =
  8. 8.31² =
  9. 9.48² =
  10. 10.72² =
  11. 11.91² =
  12. 12.37² =
  13. 13.77² =
  14. 14.79² =
  15. 15.89² =
  16. 16.98² =
  17. 17.63² =
  18. 18.61² =
  19. 19.49² =
  20. 20.58² =
  21. 21.34² =
  22. 22.52² =
  23. 23.97² =
  24. 24.86² =
  25. 25.81² =
  26. 26.35² =
  27. 27.62² =
  28. 28.64² =
  29. 29.95² =
  30. 30.93² =
  31. 31.39² =
  32. 32.43² =
  33. 33.67² =
  34. 34.36² =
  35. 35.57² =
  36. 36.87² =
  37. 37.33² =
  38. 38.65² =
  39. 39.83² =
  40. 40.46² =

Answer key

  1. 1764
  2. 5476
  3. 2601
  4. 1936
  5. 5625
  6. 1444
  7. 2025
  8. 961
  9. 2304
  10. 5184
  11. 8281
  12. 1369
  13. 5929
  14. 6241
  15. 7921
  16. 9604
  17. 3969
  18. 3721
  19. 2401
  20. 3364
  21. 1156
  22. 2704
  23. 9409
  24. 7396
  25. 6561
  26. 1225
  27. 3844
  28. 4096
  29. 9025
  30. 8649
  31. 1521
  32. 1849
  33. 4489
  34. 1296
  35. 3249
  36. 7569
  37. 1089
  38. 4225
  39. 6889
  40. 2116

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