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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 184 · 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. 1.75² =
  2. 2.87² =
  3. 3.49² =
  4. 4.72² =
  5. 5.68² =
  6. 6.35² =
  7. 7.38² =
  8. 8.91² =
  9. 9.64² =
  10. 10.59² =
  11. 11.82² =
  12. 12.31² =
  13. 13.46² =
  14. 14.39² =
  15. 15.71² =
  16. 16.61² =
  17. 17.56² =
  18. 18.86² =
  19. 19.92² =
  20. 20.63² =
  21. 21.36² =
  22. 22.51² =
  23. 23.54² =
  24. 24.47² =
  25. 25.84² =
  26. 26.34² =
  27. 27.95² =
  28. 28.45² =
  29. 29.53² =
  30. 30.41² =
  31. 31.58² =
  32. 32.99² =
  33. 33.33² =
  34. 34.62² =
  35. 35.77² =
  36. 36.88² =
  37. 37.65² =
  38. 38.43² =
  39. 39.69² =
  40. 40.78² =

Answer key

  1. 5625
  2. 7569
  3. 2401
  4. 5184
  5. 4624
  6. 1225
  7. 1444
  8. 8281
  9. 4096
  10. 3481
  11. 6724
  12. 961
  13. 2116
  14. 1521
  15. 5041
  16. 3721
  17. 3136
  18. 7396
  19. 8464
  20. 3969
  21. 1296
  22. 2601
  23. 2916
  24. 2209
  25. 7056
  26. 1156
  27. 9025
  28. 2025
  29. 2809
  30. 1681
  31. 3364
  32. 9801
  33. 1089
  34. 3844
  35. 5929
  36. 7744
  37. 4225
  38. 1849
  39. 4761
  40. 6084

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