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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 379 · 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. 1.95² =
  2. 2.61² =
  3. 3.39² =
  4. 4.43² =
  5. 5.91² =
  6. 6.78² =
  7. 7.42² =
  8. 8.32² =
  9. 9.84² =
  10. 10.51² =
  11. 11.54² =
  12. 12.55² =
  13. 13.85² =
  14. 14.67² =
  15. 15.33² =
  16. 16.94² =
  17. 17.89² =
  18. 18.47² =
  19. 19.96² =
  20. 20.87² =
  21. 21.88² =
  22. 22.77² =
  23. 23.41² =
  24. 24.34² =
  25. 25.81² =
  26. 26.64² =
  27. 27.75² =
  28. 28.59² =
  29. 29.68² =
  30. 30.44² =
  31. 31.92² =
  32. 32.37² =
  33. 33.99² =
  34. 34.65² =
  35. 35.57² =
  36. 36.66² =
  37. 37.74² =
  38. 38.56² =
  39. 39.62² =
  40. 40.46² =

Answer key

  1. 9025
  2. 3721
  3. 1521
  4. 1849
  5. 8281
  6. 6084
  7. 1764
  8. 1024
  9. 7056
  10. 2601
  11. 2916
  12. 3025
  13. 7225
  14. 4489
  15. 1089
  16. 8836
  17. 7921
  18. 2209
  19. 9216
  20. 7569
  21. 7744
  22. 5929
  23. 1681
  24. 1156
  25. 6561
  26. 4096
  27. 5625
  28. 3481
  29. 4624
  30. 1936
  31. 8464
  32. 1369
  33. 9801
  34. 4225
  35. 3249
  36. 4356
  37. 5476
  38. 3136
  39. 3844
  40. 2116

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