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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 320 · 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. 1.63² =
  2. 2.75² =
  3. 3.91² =
  4. 4.49² =
  5. 5.81² =
  6. 6.43² =
  7. 7.61² =
  8. 8.36² =
  9. 9.95² =
  10. 10.87² =
  11. 11.69² =
  12. 12.58² =
  13. 13.42² =
  14. 14.62² =
  15. 15.74² =
  16. 16.82² =
  17. 17.68² =
  18. 18.56² =
  19. 19.65² =
  20. 20.71² =
  21. 21.97² =
  22. 22.44² =
  23. 23.46² =
  24. 24.54² =
  25. 25.72² =
  26. 26.35² =
  27. 27.41² =
  28. 28.52² =
  29. 29.59² =
  30. 30.98² =
  31. 31.55² =
  32. 32.31² =
  33. 33.51² =
  34. 34.94² =
  35. 35.34² =
  36. 36.32² =
  37. 37.53² =
  38. 38.45² =
  39. 39.38² =
  40. 40.99² =

Answer key

  1. 3969
  2. 5625
  3. 8281
  4. 2401
  5. 6561
  6. 1849
  7. 3721
  8. 1296
  9. 9025
  10. 7569
  11. 4761
  12. 3364
  13. 1764
  14. 3844
  15. 5476
  16. 6724
  17. 4624
  18. 3136
  19. 4225
  20. 5041
  21. 9409
  22. 1936
  23. 2116
  24. 2916
  25. 5184
  26. 1225
  27. 1681
  28. 2704
  29. 3481
  30. 9604
  31. 3025
  32. 961
  33. 2601
  34. 8836
  35. 1156
  36. 1024
  37. 2809
  38. 2025
  39. 1444
  40. 9801

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