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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 85 · 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. 1.62² =
  2. 2.53² =
  3. 3.79² =
  4. 4.92² =
  5. 5.82² =
  6. 6.96² =
  7. 7.58² =
  8. 8.36² =
  9. 9.54² =
  10. 10.71² =
  11. 11.51² =
  12. 12.87² =
  13. 13.91² =
  14. 14.76² =
  15. 15.46² =
  16. 16.32² =
  17. 17.34² =
  18. 18.42² =
  19. 19.69² =
  20. 20.48² =
  21. 21.86² =
  22. 22.99² =
  23. 23.97² =
  24. 24.33² =
  25. 25.85² =
  26. 26.63² =
  27. 27.35² =
  28. 28.77² =
  29. 29.66² =
  30. 30.47² =
  31. 31.94² =
  32. 32.93² =
  33. 33.74² =
  34. 34.43² =
  35. 35.68² =
  36. 36.41² =
  37. 37.95² =
  38. 38.52² =
  39. 39.56² =
  40. 40.38² =

Answer key

  1. 3844
  2. 2809
  3. 6241
  4. 8464
  5. 6724
  6. 9216
  7. 3364
  8. 1296
  9. 2916
  10. 5041
  11. 2601
  12. 7569
  13. 8281
  14. 5776
  15. 2116
  16. 1024
  17. 1156
  18. 1764
  19. 4761
  20. 2304
  21. 7396
  22. 9801
  23. 9409
  24. 1089
  25. 7225
  26. 3969
  27. 1225
  28. 5929
  29. 4356
  30. 2209
  31. 8836
  32. 8649
  33. 5476
  34. 1849
  35. 4624
  36. 1681
  37. 9025
  38. 2704
  39. 3136
  40. 1444

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