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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 59 · 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. 1.97² =
  2. 2.35² =
  3. 3.56² =
  4. 4.71² =
  5. 5.46² =
  6. 6.84² =
  7. 7.85² =
  8. 8.64² =
  9. 9.77² =
  10. 10.69² =
  11. 11.92² =
  12. 12.47² =
  13. 13.65² =
  14. 14.59² =
  15. 15.39² =
  16. 16.31² =
  17. 17.79² =
  18. 18.74² =
  19. 19.45² =
  20. 20.94² =
  21. 21.43² =
  22. 22.96² =
  23. 23.51² =
  24. 24.63² =
  25. 25.44² =
  26. 26.55² =
  27. 27.82² =
  28. 28.36² =
  29. 29.41² =
  30. 30.33² =
  31. 31.49² =
  32. 32.76² =
  33. 33.53² =
  34. 34.88² =
  35. 35.34² =
  36. 36.83² =
  37. 37.61² =
  38. 38.68² =
  39. 39.86² =
  40. 40.91² =

Answer key

  1. 9409
  2. 1225
  3. 3136
  4. 5041
  5. 2116
  6. 7056
  7. 7225
  8. 4096
  9. 5929
  10. 4761
  11. 8464
  12. 2209
  13. 4225
  14. 3481
  15. 1521
  16. 961
  17. 6241
  18. 5476
  19. 2025
  20. 8836
  21. 1849
  22. 9216
  23. 2601
  24. 3969
  25. 1936
  26. 3025
  27. 6724
  28. 1296
  29. 1681
  30. 1089
  31. 2401
  32. 5776
  33. 2809
  34. 7744
  35. 1156
  36. 6889
  37. 3721
  38. 4624
  39. 7396
  40. 8281

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