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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 290 · 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. 1.66² =
  2. 2.55² =
  3. 3.85² =
  4. 4.33² =
  5. 5.61² =
  6. 6.92² =
  7. 7.42² =
  8. 8.39² =
  9. 9.73² =
  10. 10.32² =
  11. 11.36² =
  12. 12.47² =
  13. 13.34² =
  14. 14.68² =
  15. 15.77² =
  16. 16.98² =
  17. 17.65² =
  18. 18.76² =
  19. 19.48² =
  20. 20.89² =
  21. 21.81² =
  22. 22.91² =
  23. 23.49² =
  24. 24.83² =
  25. 25.31² =
  26. 26.75² =
  27. 27.82² =
  28. 28.64² =
  29. 29.74² =
  30. 30.54² =
  31. 31.96² =
  32. 32.71² =
  33. 33.56² =
  34. 34.51² =
  35. 35.58² =
  36. 36.44² =
  37. 37.59² =
  38. 38.57² =
  39. 39.46² =
  40. 40.97² =

Answer key

  1. 4356
  2. 3025
  3. 7225
  4. 1089
  5. 3721
  6. 8464
  7. 1764
  8. 1521
  9. 5329
  10. 1024
  11. 1296
  12. 2209
  13. 1156
  14. 4624
  15. 5929
  16. 9604
  17. 4225
  18. 5776
  19. 2304
  20. 7921
  21. 6561
  22. 8281
  23. 2401
  24. 6889
  25. 961
  26. 5625
  27. 6724
  28. 4096
  29. 5476
  30. 2916
  31. 9216
  32. 5041
  33. 3136
  34. 2601
  35. 3364
  36. 1936
  37. 3481
  38. 3249
  39. 2116
  40. 9409

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