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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 148 · 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. 2.56² =
  3. 3.62² =
  4. 4.88² =
  5. 5.32² =
  6. 6.35² =
  7. 7.72² =
  8. 8.69² =
  9. 9.92² =
  10. 10.84² =
  11. 11.59² =
  12. 12.57² =
  13. 13.31² =
  14. 14.99² =
  15. 15.78² =
  16. 16.36² =
  17. 17.76² =
  18. 18.81² =
  19. 19.47² =
  20. 20.51² =
  21. 21.91² =
  22. 22.75² =
  23. 23.33² =
  24. 24.86² =
  25. 25.46² =
  26. 26.63² =
  27. 27.54² =
  28. 28.89² =
  29. 29.58² =
  30. 30.93² =
  31. 31.44² =
  32. 32.39² =
  33. 33.73² =
  34. 34.48² =
  35. 35.45² =
  36. 36.41² =
  37. 37.55² =
  38. 38.65² =
  39. 39.34² =
  40. 40.66² =

Answer key

  1. 1849
  2. 3136
  3. 3844
  4. 7744
  5. 1024
  6. 1225
  7. 5184
  8. 4761
  9. 8464
  10. 7056
  11. 3481
  12. 3249
  13. 961
  14. 9801
  15. 6084
  16. 1296
  17. 5776
  18. 6561
  19. 2209
  20. 2601
  21. 8281
  22. 5625
  23. 1089
  24. 7396
  25. 2116
  26. 3969
  27. 2916
  28. 7921
  29. 3364
  30. 8649
  31. 1936
  32. 1521
  33. 5329
  34. 2304
  35. 2025
  36. 1681
  37. 3025
  38. 4225
  39. 1156
  40. 4356

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