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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 259 · 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. 1.54² =
  2. 2.39² =
  3. 3.85² =
  4. 4.76² =
  5. 5.93² =
  6. 6.52² =
  7. 7.43² =
  8. 8.51² =
  9. 9.36² =
  10. 10.49² =
  11. 11.44² =
  12. 12.41² =
  13. 13.89² =
  14. 14.38² =
  15. 15.71² =
  16. 16.57² =
  17. 17.61² =
  18. 18.73² =
  19. 19.96² =
  20. 20.34² =
  21. 21.62² =
  22. 22.82² =
  23. 23.86² =
  24. 24.33² =
  25. 25.32² =
  26. 26.47² =
  27. 27.99² =
  28. 28.81² =
  29. 29.45² =
  30. 30.35² =
  31. 31.91² =
  32. 32.88² =
  33. 33.95² =
  34. 34.46² =
  35. 35.83² =
  36. 36.84² =
  37. 37.31² =
  38. 38.53² =
  39. 39.75² =
  40. 40.64² =

Answer key

  1. 2916
  2. 1521
  3. 7225
  4. 5776
  5. 8649
  6. 2704
  7. 1849
  8. 2601
  9. 1296
  10. 2401
  11. 1936
  12. 1681
  13. 7921
  14. 1444
  15. 5041
  16. 3249
  17. 3721
  18. 5329
  19. 9216
  20. 1156
  21. 3844
  22. 6724
  23. 7396
  24. 1089
  25. 1024
  26. 2209
  27. 9801
  28. 6561
  29. 2025
  30. 1225
  31. 8281
  32. 7744
  33. 9025
  34. 2116
  35. 6889
  36. 7056
  37. 961
  38. 2809
  39. 5625
  40. 4096

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