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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 80 · 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. 1.83² =
  2. 2.68² =
  3. 3.41² =
  4. 4.55² =
  5. 5.42² =
  6. 6.61² =
  7. 7.85² =
  8. 8.81² =
  9. 9.99² =
  10. 10.56² =
  11. 11.57² =
  12. 12.89² =
  13. 13.39² =
  14. 14.53² =
  15. 15.45² =
  16. 16.72² =
  17. 17.94² =
  18. 18.77² =
  19. 19.47² =
  20. 20.87² =
  21. 21.37² =
  22. 22.75² =
  23. 23.31² =
  24. 24.59² =
  25. 25.78² =
  26. 26.69² =
  27. 27.95² =
  28. 28.35² =
  29. 29.71² =
  30. 30.44² =
  31. 31.64² =
  32. 32.92² =
  33. 33.96² =
  34. 34.91² =
  35. 35.84² =
  36. 36.46² =
  37. 37.58² =
  38. 38.34² =
  39. 39.65² =
  40. 40.97² =

Answer key

  1. 6889
  2. 4624
  3. 1681
  4. 3025
  5. 1764
  6. 3721
  7. 7225
  8. 6561
  9. 9801
  10. 3136
  11. 3249
  12. 7921
  13. 1521
  14. 2809
  15. 2025
  16. 5184
  17. 8836
  18. 5929
  19. 2209
  20. 7569
  21. 1369
  22. 5625
  23. 961
  24. 3481
  25. 6084
  26. 4761
  27. 9025
  28. 1225
  29. 5041
  30. 1936
  31. 4096
  32. 8464
  33. 9216
  34. 8281
  35. 7056
  36. 2116
  37. 3364
  38. 1156
  39. 4225
  40. 9409

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