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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 118 · 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. 2.41² =
  3. 3.86² =
  4. 4.74² =
  5. 5.42² =
  6. 6.97² =
  7. 7.95² =
  8. 8.57² =
  9. 9.51² =
  10. 10.71² =
  11. 11.47² =
  12. 12.92² =
  13. 13.81² =
  14. 14.79² =
  15. 15.94² =
  16. 16.82² =
  17. 17.75² =
  18. 18.67² =
  19. 19.63² =
  20. 20.37² =
  21. 21.31² =
  22. 22.84² =
  23. 23.85² =
  24. 24.77² =
  25. 25.87² =
  26. 26.89² =
  27. 27.93² =
  28. 28.35² =
  29. 29.62² =
  30. 30.68² =
  31. 31.55² =
  32. 32.69² =
  33. 33.99² =
  34. 34.61² =
  35. 35.38² =
  36. 36.96² =
  37. 37.91² =
  38. 38.36² =
  39. 39.49² =
  40. 40.48² =

Answer key

  1. 4225
  2. 1681
  3. 7396
  4. 5476
  5. 1764
  6. 9409
  7. 9025
  8. 3249
  9. 2601
  10. 5041
  11. 2209
  12. 8464
  13. 6561
  14. 6241
  15. 8836
  16. 6724
  17. 5625
  18. 4489
  19. 3969
  20. 1369
  21. 961
  22. 7056
  23. 7225
  24. 5929
  25. 7569
  26. 7921
  27. 8649
  28. 1225
  29. 3844
  30. 4624
  31. 3025
  32. 4761
  33. 9801
  34. 3721
  35. 1444
  36. 9216
  37. 8281
  38. 1296
  39. 2401
  40. 2304

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