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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 455 · 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. 1.73² =
  2. 2.78² =
  3. 3.35² =
  4. 4.74² =
  5. 5.51² =
  6. 6.85² =
  7. 7.89² =
  8. 8.41² =
  9. 9.33² =
  10. 10.72² =
  11. 11.45² =
  12. 12.71² =
  13. 13.46² =
  14. 14.91² =
  15. 15.37² =
  16. 16.77² =
  17. 17.36² =
  18. 18.57² =
  19. 19.65² =
  20. 20.55² =
  21. 21.31² =
  22. 22.79² =
  23. 23.63² =
  24. 24.98² =
  25. 25.96² =
  26. 26.81² =
  27. 27.86² =
  28. 28.64² =
  29. 29.43² =
  30. 30.44² =
  31. 31.61² =
  32. 32.62² =
  33. 33.56² =
  34. 34.84² =
  35. 35.99² =
  36. 36.42² =
  37. 37.82² =
  38. 38.83² =
  39. 39.52² =
  40. 40.38² =

Answer key

  1. 5329
  2. 6084
  3. 1225
  4. 5476
  5. 2601
  6. 7225
  7. 7921
  8. 1681
  9. 1089
  10. 5184
  11. 2025
  12. 5041
  13. 2116
  14. 8281
  15. 1369
  16. 5929
  17. 1296
  18. 3249
  19. 4225
  20. 3025
  21. 961
  22. 6241
  23. 3969
  24. 9604
  25. 9216
  26. 6561
  27. 7396
  28. 4096
  29. 1849
  30. 1936
  31. 3721
  32. 3844
  33. 3136
  34. 7056
  35. 9801
  36. 1764
  37. 6724
  38. 6889
  39. 2704
  40. 1444

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