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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 334 · 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. 1.79² =
  2. 2.35² =
  3. 3.34² =
  4. 4.87² =
  5. 5.92² =
  6. 6.62² =
  7. 7.86² =
  8. 8.69² =
  9. 9.91² =
  10. 10.97² =
  11. 11.46² =
  12. 12.94² =
  13. 13.75² =
  14. 14.65² =
  15. 15.31² =
  16. 16.61² =
  17. 17.73² =
  18. 18.44² =
  19. 19.45² =
  20. 20.78² =
  21. 21.55² =
  22. 22.95² =
  23. 23.77² =
  24. 24.88² =
  25. 25.84² =
  26. 26.37² =
  27. 27.56² =
  28. 28.53² =
  29. 29.85² =
  30. 30.54² =
  31. 31.41² =
  32. 32.81² =
  33. 33.82² =
  34. 34.74² =
  35. 35.93² =
  36. 36.38² =
  37. 37.83² =
  38. 38.67² =
  39. 39.71² =
  40. 40.39² =

Answer key

  1. 6241
  2. 1225
  3. 1156
  4. 7569
  5. 8464
  6. 3844
  7. 7396
  8. 4761
  9. 8281
  10. 9409
  11. 2116
  12. 8836
  13. 5625
  14. 4225
  15. 961
  16. 3721
  17. 5329
  18. 1936
  19. 2025
  20. 6084
  21. 3025
  22. 9025
  23. 5929
  24. 7744
  25. 7056
  26. 1369
  27. 3136
  28. 2809
  29. 7225
  30. 2916
  31. 1681
  32. 6561
  33. 6724
  34. 5476
  35. 8649
  36. 1444
  37. 6889
  38. 4489
  39. 5041
  40. 1521

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