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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 278 · 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. 1.81² =
  2. 2.65² =
  3. 3.75² =
  4. 4.45² =
  5. 5.41² =
  6. 6.87² =
  7. 7.97² =
  8. 8.53² =
  9. 9.38² =
  10. 10.77² =
  11. 11.44² =
  12. 12.54² =
  13. 13.58² =
  14. 14.61² =
  15. 15.79² =
  16. 16.89² =
  17. 17.95² =
  18. 18.55² =
  19. 19.88² =
  20. 20.91² =
  21. 21.85² =
  22. 22.94² =
  23. 23.43² =
  24. 24.74² =
  25. 25.36² =
  26. 26.92² =
  27. 27.48² =
  28. 28.56² =
  29. 29.64² =
  30. 30.47² =
  31. 31.78² =
  32. 32.68² =
  33. 33.62² =
  34. 34.35² =
  35. 35.31² =
  36. 36.51² =
  37. 37.84² =
  38. 38.46² =
  39. 39.33² =
  40. 40.59² =

Answer key

  1. 6561
  2. 4225
  3. 5625
  4. 2025
  5. 1681
  6. 7569
  7. 9409
  8. 2809
  9. 1444
  10. 5929
  11. 1936
  12. 2916
  13. 3364
  14. 3721
  15. 6241
  16. 7921
  17. 9025
  18. 3025
  19. 7744
  20. 8281
  21. 7225
  22. 8836
  23. 1849
  24. 5476
  25. 1296
  26. 8464
  27. 2304
  28. 3136
  29. 4096
  30. 2209
  31. 6084
  32. 4624
  33. 3844
  34. 1225
  35. 961
  36. 2601
  37. 7056
  38. 2116
  39. 1089
  40. 3481

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