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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 457 · 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. 1.65² =
  2. 2.81² =
  3. 3.78² =
  4. 4.43² =
  5. 5.49² =
  6. 6.46² =
  7. 7.39² =
  8. 8.84² =
  9. 9.93² =
  10. 10.54² =
  11. 11.86² =
  12. 12.59² =
  13. 13.51² =
  14. 14.55² =
  15. 15.94² =
  16. 16.61² =
  17. 17.44² =
  18. 18.72² =
  19. 19.42² =
  20. 20.97² =
  21. 21.41² =
  22. 22.58² =
  23. 23.89² =
  24. 24.38² =
  25. 25.76² =
  26. 26.57² =
  27. 27.98² =
  28. 28.71² =
  29. 29.77² =
  30. 30.74² =
  31. 31.91² =
  32. 32.34² =
  33. 33.83² =
  34. 34.63² =
  35. 35.87² =
  36. 36.69² =
  37. 37.67² =
  38. 38.92² =
  39. 39.53² =
  40. 40.66² =

Answer key

  1. 4225
  2. 6561
  3. 6084
  4. 1849
  5. 2401
  6. 2116
  7. 1521
  8. 7056
  9. 8649
  10. 2916
  11. 7396
  12. 3481
  13. 2601
  14. 3025
  15. 8836
  16. 3721
  17. 1936
  18. 5184
  19. 1764
  20. 9409
  21. 1681
  22. 3364
  23. 7921
  24. 1444
  25. 5776
  26. 3249
  27. 9604
  28. 5041
  29. 5929
  30. 5476
  31. 8281
  32. 1156
  33. 6889
  34. 3969
  35. 7569
  36. 4761
  37. 4489
  38. 8464
  39. 2809
  40. 4356

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