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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 681 · 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. 1.96² =
  2. 2.56² =
  3. 3.43² =
  4. 4.36² =
  5. 5.49² =
  6. 6.72² =
  7. 7.77² =
  8. 8.61² =
  9. 9.76² =
  10. 10.54² =
  11. 11.88² =
  12. 12.47² =
  13. 13.44² =
  14. 14.52² =
  15. 15.33² =
  16. 16.83² =
  17. 17.78² =
  18. 18.81² =
  19. 19.41² =
  20. 20.95² =
  21. 21.91² =
  22. 22.51² =
  23. 23.62² =
  24. 24.71² =
  25. 25.34² =
  26. 26.68² =
  27. 27.53² =
  28. 28.97² =
  29. 29.98² =
  30. 30.57² =
  31. 31.79² =
  32. 32.85² =
  33. 33.73² =
  34. 34.87² =
  35. 35.82² =
  36. 36.86² =
  37. 37.35² =
  38. 38.99² =
  39. 39.84² =
  40. 40.32² =

Answer key

  1. 9216
  2. 3136
  3. 1849
  4. 1296
  5. 2401
  6. 5184
  7. 5929
  8. 3721
  9. 5776
  10. 2916
  11. 7744
  12. 2209
  13. 1936
  14. 2704
  15. 1089
  16. 6889
  17. 6084
  18. 6561
  19. 1681
  20. 9025
  21. 8281
  22. 2601
  23. 3844
  24. 5041
  25. 1156
  26. 4624
  27. 2809
  28. 9409
  29. 9604
  30. 3249
  31. 6241
  32. 7225
  33. 5329
  34. 7569
  35. 6724
  36. 7396
  37. 1225
  38. 9801
  39. 7056
  40. 1024

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