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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 174 · 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. 1.93² =
  2. 2.75² =
  3. 3.94² =
  4. 4.48² =
  5. 5.54² =
  6. 6.51² =
  7. 7.88² =
  8. 8.67² =
  9. 9.34² =
  10. 10.39² =
  11. 11.74² =
  12. 12.41² =
  13. 13.72² =
  14. 14.49² =
  15. 15.95² =
  16. 16.98² =
  17. 17.91² =
  18. 18.31² =
  19. 19.97² =
  20. 20.57² =
  21. 21.92² =
  22. 22.69² =
  23. 23.42² =
  24. 24.89² =
  25. 25.56² =
  26. 26.81² =
  27. 27.83² =
  28. 28.62² =
  29. 29.68² =
  30. 30.79² =
  31. 31.61² =
  32. 32.44² =
  33. 33.45² =
  34. 34.85² =
  35. 35.65² =
  36. 36.38² =
  37. 37.63² =
  38. 38.37² =
  39. 39.64² =
  40. 40.76² =

Answer key

  1. 8649
  2. 5625
  3. 8836
  4. 2304
  5. 2916
  6. 2601
  7. 7744
  8. 4489
  9. 1156
  10. 1521
  11. 5476
  12. 1681
  13. 5184
  14. 2401
  15. 9025
  16. 9604
  17. 8281
  18. 961
  19. 9409
  20. 3249
  21. 8464
  22. 4761
  23. 1764
  24. 7921
  25. 3136
  26. 6561
  27. 6889
  28. 3844
  29. 4624
  30. 6241
  31. 3721
  32. 1936
  33. 2025
  34. 7225
  35. 4225
  36. 1444
  37. 3969
  38. 1369
  39. 4096
  40. 5776

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