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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 563 · 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. 2.77² =
  3. 3.84² =
  4. 4.41² =
  5. 5.37² =
  6. 6.42² =
  7. 7.63² =
  8. 8.56² =
  9. 9.87² =
  10. 10.74² =
  11. 11.58² =
  12. 12.61² =
  13. 13.62² =
  14. 14.72² =
  15. 15.96² =
  16. 16.45² =
  17. 17.43² =
  18. 18.92² =
  19. 19.85² =
  20. 20.39² =
  21. 21.52² =
  22. 22.73² =
  23. 23.33² =
  24. 24.35² =
  25. 25.98² =
  26. 26.55² =
  27. 27.81² =
  28. 28.53² =
  29. 29.78² =
  30. 30.88² =
  31. 31.86² =
  32. 32.32² =
  33. 33.67² =
  34. 34.76² =
  35. 35.48² =
  36. 36.97² =
  37. 37.44² =
  38. 38.93² =
  39. 39.54² =
  40. 40.51² =

Answer key

  1. 6241
  2. 5929
  3. 7056
  4. 1681
  5. 1369
  6. 1764
  7. 3969
  8. 3136
  9. 7569
  10. 5476
  11. 3364
  12. 3721
  13. 3844
  14. 5184
  15. 9216
  16. 2025
  17. 1849
  18. 8464
  19. 7225
  20. 1521
  21. 2704
  22. 5329
  23. 1089
  24. 1225
  25. 9604
  26. 3025
  27. 6561
  28. 2809
  29. 6084
  30. 7744
  31. 7396
  32. 1024
  33. 4489
  34. 5776
  35. 2304
  36. 9409
  37. 1936
  38. 8649
  39. 2916
  40. 2601

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