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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 630 · 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. 1.74² =
  2. 2.97² =
  3. 3.99² =
  4. 4.33² =
  5. 5.44² =
  6. 6.67² =
  7. 7.93² =
  8. 8.58² =
  9. 9.76² =
  10. 10.61² =
  11. 11.56² =
  12. 12.68² =
  13. 13.54² =
  14. 14.62² =
  15. 15.53² =
  16. 16.59² =
  17. 17.32² =
  18. 18.95² =
  19. 19.36² =
  20. 20.86² =
  21. 21.38² =
  22. 22.51² =
  23. 23.39² =
  24. 24.35² =
  25. 25.41² =
  26. 26.87² =
  27. 27.85² =
  28. 28.91² =
  29. 29.65² =
  30. 30.72² =
  31. 31.46² =
  32. 32.63² =
  33. 33.49² =
  34. 34.98² =
  35. 35.52² =
  36. 36.42² =
  37. 37.81² =
  38. 38.37² =
  39. 39.55² =
  40. 40.82² =

Answer key

  1. 5476
  2. 9409
  3. 9801
  4. 1089
  5. 1936
  6. 4489
  7. 8649
  8. 3364
  9. 5776
  10. 3721
  11. 3136
  12. 4624
  13. 2916
  14. 3844
  15. 2809
  16. 3481
  17. 1024
  18. 9025
  19. 1296
  20. 7396
  21. 1444
  22. 2601
  23. 1521
  24. 1225
  25. 1681
  26. 7569
  27. 7225
  28. 8281
  29. 4225
  30. 5184
  31. 2116
  32. 3969
  33. 2401
  34. 9604
  35. 2704
  36. 1764
  37. 6561
  38. 1369
  39. 3025
  40. 6724

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