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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 217 · 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. 1.33² =
  2. 2.93² =
  3. 3.75² =
  4. 4.82² =
  5. 5.95² =
  6. 6.52² =
  7. 7.94² =
  8. 8.96² =
  9. 9.79² =
  10. 10.65² =
  11. 11.47² =
  12. 12.61² =
  13. 13.91² =
  14. 14.76² =
  15. 15.51² =
  16. 16.73² =
  17. 17.71² =
  18. 18.56² =
  19. 19.41² =
  20. 20.38² =
  21. 21.86² =
  22. 22.87² =
  23. 23.37² =
  24. 24.83² =
  25. 25.68² =
  26. 26.59² =
  27. 27.81² =
  28. 28.43² =
  29. 29.34² =
  30. 30.88² =
  31. 31.57² =
  32. 32.53² =
  33. 33.85² =
  34. 34.46² =
  35. 35.77² =
  36. 36.36² =
  37. 37.98² =
  38. 38.55² =
  39. 39.42² =
  40. 40.39² =

Answer key

  1. 1089
  2. 8649
  3. 5625
  4. 6724
  5. 9025
  6. 2704
  7. 8836
  8. 9216
  9. 6241
  10. 4225
  11. 2209
  12. 3721
  13. 8281
  14. 5776
  15. 2601
  16. 5329
  17. 5041
  18. 3136
  19. 1681
  20. 1444
  21. 7396
  22. 7569
  23. 1369
  24. 6889
  25. 4624
  26. 3481
  27. 6561
  28. 1849
  29. 1156
  30. 7744
  31. 3249
  32. 2809
  33. 7225
  34. 2116
  35. 5929
  36. 1296
  37. 9604
  38. 3025
  39. 1764
  40. 1521

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