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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 42 · 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. 1.32² =
  2. 2.38² =
  3. 3.65² =
  4. 4.31² =
  5. 5.42² =
  6. 6.58² =
  7. 7.86² =
  8. 8.41² =
  9. 9.87² =
  10. 10.81² =
  11. 11.57² =
  12. 12.82² =
  13. 13.34² =
  14. 14.95² =
  15. 15.71² =
  16. 16.89² =
  17. 17.78² =
  18. 18.45² =
  19. 19.61² =
  20. 20.99² =
  21. 21.96² =
  22. 22.43² =
  23. 23.47² =
  24. 24.64² =
  25. 25.35² =
  26. 26.91² =
  27. 27.53² =
  28. 28.51² =
  29. 29.72² =
  30. 30.37² =
  31. 31.63² =
  32. 32.36² =
  33. 33.59² =
  34. 34.52² =
  35. 35.79² =
  36. 36.44² =
  37. 37.49² =
  38. 38.55² =
  39. 39.67² =
  40. 40.93² =

Answer key

  1. 1024
  2. 1444
  3. 4225
  4. 961
  5. 1764
  6. 3364
  7. 7396
  8. 1681
  9. 7569
  10. 6561
  11. 3249
  12. 6724
  13. 1156
  14. 9025
  15. 5041
  16. 7921
  17. 6084
  18. 2025
  19. 3721
  20. 9801
  21. 9216
  22. 1849
  23. 2209
  24. 4096
  25. 1225
  26. 8281
  27. 2809
  28. 2601
  29. 5184
  30. 1369
  31. 3969
  32. 1296
  33. 3481
  34. 2704
  35. 6241
  36. 1936
  37. 2401
  38. 3025
  39. 4489
  40. 8649

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