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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 113 · 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. 1.79² =
  2. 2.76² =
  3. 3.69² =
  4. 4.45² =
  5. 5.55² =
  6. 6.83² =
  7. 7.33² =
  8. 8.52² =
  9. 9.81² =
  10. 10.75² =
  11. 11.54² =
  12. 12.41² =
  13. 13.86² =
  14. 14.39² =
  15. 15.96² =
  16. 16.47² =
  17. 17.63² =
  18. 18.97² =
  19. 19.51² =
  20. 20.85² =
  21. 21.38² =
  22. 22.98² =
  23. 23.37² =
  24. 24.49² =
  25. 25.95² =
  26. 26.82² =
  27. 27.57² =
  28. 28.71² =
  29. 29.65² =
  30. 30.43² =
  31. 31.99² =
  32. 32.64² =
  33. 33.42² =
  34. 34.68² =
  35. 35.61² =
  36. 36.77² =
  37. 37.73² =
  38. 38.35² =
  39. 39.31² =
  40. 40.92² =

Answer key

  1. 6241
  2. 5776
  3. 4761
  4. 2025
  5. 3025
  6. 6889
  7. 1089
  8. 2704
  9. 6561
  10. 5625
  11. 2916
  12. 1681
  13. 7396
  14. 1521
  15. 9216
  16. 2209
  17. 3969
  18. 9409
  19. 2601
  20. 7225
  21. 1444
  22. 9604
  23. 1369
  24. 2401
  25. 9025
  26. 6724
  27. 3249
  28. 5041
  29. 4225
  30. 1849
  31. 9801
  32. 4096
  33. 1764
  34. 4624
  35. 3721
  36. 5929
  37. 5329
  38. 1225
  39. 961
  40. 8464

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