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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 753 · 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. 2.97² =
  3. 3.99² =
  4. 4.55² =
  5. 5.32² =
  6. 6.85² =
  7. 7.41² =
  8. 8.56² =
  9. 9.42² =
  10. 10.66² =
  11. 11.31² =
  12. 12.83² =
  13. 13.82² =
  14. 14.59² =
  15. 15.62² =
  16. 16.49² =
  17. 17.46² =
  18. 18.53² =
  19. 19.91² =
  20. 20.34² =
  21. 21.36² =
  22. 22.33² =
  23. 23.43² =
  24. 24.38² =
  25. 25.61² =
  26. 26.69² =
  27. 27.45² =
  28. 28.78² =
  29. 29.67² =
  30. 30.87² =
  31. 31.92² =
  32. 32.72² =
  33. 33.88² =
  34. 34.57² =
  35. 35.35² =
  36. 36.76² =
  37. 37.58² =
  38. 38.63² =
  39. 39.51² =
  40. 40.47² =

Answer key

  1. 4225
  2. 9409
  3. 9801
  4. 3025
  5. 1024
  6. 7225
  7. 1681
  8. 3136
  9. 1764
  10. 4356
  11. 961
  12. 6889
  13. 6724
  14. 3481
  15. 3844
  16. 2401
  17. 2116
  18. 2809
  19. 8281
  20. 1156
  21. 1296
  22. 1089
  23. 1849
  24. 1444
  25. 3721
  26. 4761
  27. 2025
  28. 6084
  29. 4489
  30. 7569
  31. 8464
  32. 5184
  33. 7744
  34. 3249
  35. 1225
  36. 5776
  37. 3364
  38. 3969
  39. 2601
  40. 2209

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