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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 532 · 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. 1.43² =
  2. 2.33² =
  3. 3.51² =
  4. 4.76² =
  5. 5.87² =
  6. 6.62² =
  7. 7.57² =
  8. 8.64² =
  9. 9.58² =
  10. 10.56² =
  11. 11.79² =
  12. 12.32² =
  13. 13.88² =
  14. 14.54² =
  15. 15.69² =
  16. 16.42² =
  17. 17.55² =
  18. 18.37² =
  19. 19.93² =
  20. 20.44² =
  21. 21.89² =
  22. 22.36² =
  23. 23.41² =
  24. 24.45² =
  25. 25.65² =
  26. 26.52² =
  27. 27.91² =
  28. 28.34² =
  29. 29.61² =
  30. 30.77² =
  31. 31.72² =
  32. 32.38² =
  33. 33.81² =
  34. 34.49² =
  35. 35.74² =
  36. 36.84² =
  37. 37.46² =
  38. 38.92² =
  39. 39.96² =
  40. 40.71² =

Answer key

  1. 1849
  2. 1089
  3. 2601
  4. 5776
  5. 7569
  6. 3844
  7. 3249
  8. 4096
  9. 3364
  10. 3136
  11. 6241
  12. 1024
  13. 7744
  14. 2916
  15. 4761
  16. 1764
  17. 3025
  18. 1369
  19. 8649
  20. 1936
  21. 7921
  22. 1296
  23. 1681
  24. 2025
  25. 4225
  26. 2704
  27. 8281
  28. 1156
  29. 3721
  30. 5929
  31. 5184
  32. 1444
  33. 6561
  34. 2401
  35. 5476
  36. 7056
  37. 2116
  38. 8464
  39. 9216
  40. 5041

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