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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 109 · 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. 1.49² =
  2. 2.84² =
  3. 3.68² =
  4. 4.41² =
  5. 5.42² =
  6. 6.48² =
  7. 7.92² =
  8. 8.67² =
  9. 9.91² =
  10. 10.54² =
  11. 11.38² =
  12. 12.35² =
  13. 13.37² =
  14. 14.62² =
  15. 15.96² =
  16. 16.94² =
  17. 17.65² =
  18. 18.79² =
  19. 19.82² =
  20. 20.58² =
  21. 21.86² =
  22. 22.98² =
  23. 23.81² =
  24. 24.44² =
  25. 25.75² =
  26. 26.83² =
  27. 27.39² =
  28. 28.93² =
  29. 29.76² =
  30. 30.77² =
  31. 31.51² =
  32. 32.34² =
  33. 33.43² =
  34. 34.55² =
  35. 35.53² =
  36. 36.74² =
  37. 37.78² =
  38. 38.61² =
  39. 39.89² =
  40. 40.99² =

Answer key

  1. 2401
  2. 7056
  3. 4624
  4. 1681
  5. 1764
  6. 2304
  7. 8464
  8. 4489
  9. 8281
  10. 2916
  11. 1444
  12. 1225
  13. 1369
  14. 3844
  15. 9216
  16. 8836
  17. 4225
  18. 6241
  19. 6724
  20. 3364
  21. 7396
  22. 9604
  23. 6561
  24. 1936
  25. 5625
  26. 6889
  27. 1521
  28. 8649
  29. 5776
  30. 5929
  31. 2601
  32. 1156
  33. 1849
  34. 3025
  35. 2809
  36. 5476
  37. 6084
  38. 3721
  39. 7921
  40. 9801

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