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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 742 · 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. 1.69² =
  2. 2.42² =
  3. 3.84² =
  4. 4.82² =
  5. 5.45² =
  6. 6.33² =
  7. 7.91² =
  8. 8.49² =
  9. 9.46² =
  10. 10.81² =
  11. 11.38² =
  12. 12.75² =
  13. 13.89² =
  14. 14.85² =
  15. 15.62² =
  16. 16.39² =
  17. 17.58² =
  18. 18.43² =
  19. 19.47² =
  20. 20.97² =
  21. 21.54² =
  22. 22.48² =
  23. 23.76² =
  24. 24.79² =
  25. 25.52² =
  26. 26.55² =
  27. 27.86² =
  28. 28.92² =
  29. 29.77² =
  30. 30.56² =
  31. 31.57² =
  32. 32.61² =
  33. 33.98² =
  34. 34.51² =
  35. 35.73² =
  36. 36.37² =
  37. 37.83² =
  38. 38.41² =
  39. 39.99² =
  40. 40.87² =

Answer key

  1. 4761
  2. 1764
  3. 7056
  4. 6724
  5. 2025
  6. 1089
  7. 8281
  8. 2401
  9. 2116
  10. 6561
  11. 1444
  12. 5625
  13. 7921
  14. 7225
  15. 3844
  16. 1521
  17. 3364
  18. 1849
  19. 2209
  20. 9409
  21. 2916
  22. 2304
  23. 5776
  24. 6241
  25. 2704
  26. 3025
  27. 7396
  28. 8464
  29. 5929
  30. 3136
  31. 3249
  32. 3721
  33. 9604
  34. 2601
  35. 5329
  36. 1369
  37. 6889
  38. 1681
  39. 9801
  40. 7569

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