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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 504 · 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. 1.34² =
  2. 2.56² =
  3. 3.45² =
  4. 4.86² =
  5. 5.99² =
  6. 6.81² =
  7. 7.73² =
  8. 8.57² =
  9. 9.37² =
  10. 10.95² =
  11. 11.47² =
  12. 12.91² =
  13. 13.36² =
  14. 14.65² =
  15. 15.52² =
  16. 16.97² =
  17. 17.75² =
  18. 18.72² =
  19. 19.53² =
  20. 20.35² =
  21. 21.61² =
  22. 22.54² =
  23. 23.33² =
  24. 24.49² =
  25. 25.79² =
  26. 26.43² =
  27. 27.83² =
  28. 28.41² =
  29. 29.78² =
  30. 30.55² =
  31. 31.94² =
  32. 32.74² =
  33. 33.96² =
  34. 34.39² =
  35. 35.51² =
  36. 36.31² =
  37. 37.71² =
  38. 38.62² =
  39. 39.58² =
  40. 40.85² =

Answer key

  1. 1156
  2. 3136
  3. 2025
  4. 7396
  5. 9801
  6. 6561
  7. 5329
  8. 3249
  9. 1369
  10. 9025
  11. 2209
  12. 8281
  13. 1296
  14. 4225
  15. 2704
  16. 9409
  17. 5625
  18. 5184
  19. 2809
  20. 1225
  21. 3721
  22. 2916
  23. 1089
  24. 2401
  25. 6241
  26. 1849
  27. 6889
  28. 1681
  29. 6084
  30. 3025
  31. 8836
  32. 5476
  33. 9216
  34. 1521
  35. 2601
  36. 961
  37. 5041
  38. 3844
  39. 3364
  40. 7225

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