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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 60 · 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. 1.97² =
  2. 2.63² =
  3. 3.85² =
  4. 4.77² =
  5. 5.39² =
  6. 6.88² =
  7. 7.41² =
  8. 8.47² =
  9. 9.61² =
  10. 10.68² =
  11. 11.94² =
  12. 12.46² =
  13. 13.73² =
  14. 14.93² =
  15. 15.62² =
  16. 16.66² =
  17. 17.79² =
  18. 18.86² =
  19. 19.69² =
  20. 20.76² =
  21. 21.84² =
  22. 22.96² =
  23. 23.56² =
  24. 24.35² =
  25. 25.71² =
  26. 26.43² =
  27. 27.37² =
  28. 28.51² =
  29. 29.91² =
  30. 30.55² =
  31. 31.83² =
  32. 32.36² =
  33. 33.75² =
  34. 34.67² =
  35. 35.52² =
  36. 36.54² =
  37. 37.31² =
  38. 38.34² =
  39. 39.58² =
  40. 40.74² =

Answer key

  1. 9409
  2. 3969
  3. 7225
  4. 5929
  5. 1521
  6. 7744
  7. 1681
  8. 2209
  9. 3721
  10. 4624
  11. 8836
  12. 2116
  13. 5329
  14. 8649
  15. 3844
  16. 4356
  17. 6241
  18. 7396
  19. 4761
  20. 5776
  21. 7056
  22. 9216
  23. 3136
  24. 1225
  25. 5041
  26. 1849
  27. 1369
  28. 2601
  29. 8281
  30. 3025
  31. 6889
  32. 1296
  33. 5625
  34. 4489
  35. 2704
  36. 2916
  37. 961
  38. 1156
  39. 3364
  40. 5476

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