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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 713 · 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. 1.41² =
  2. 2.43² =
  3. 3.59² =
  4. 4.87² =
  5. 5.51² =
  6. 6.79² =
  7. 7.84² =
  8. 8.55² =
  9. 9.31² =
  10. 10.49² =
  11. 11.34² =
  12. 12.54² =
  13. 13.97² =
  14. 14.36² =
  15. 15.86² =
  16. 16.38² =
  17. 17.46² =
  18. 18.47² =
  19. 19.39² =
  20. 20.74² =
  21. 21.37² =
  22. 22.83² =
  23. 23.57² =
  24. 24.77² =
  25. 25.44² =
  26. 26.32² =
  27. 27.81² =
  28. 28.67² =
  29. 29.33² =
  30. 30.91² =
  31. 31.78² =
  32. 32.53² =
  33. 33.94² =
  34. 34.98² =
  35. 35.76² =
  36. 36.42² =
  37. 37.58² =
  38. 38.96² =
  39. 39.99² =
  40. 40.35² =

Answer key

  1. 1681
  2. 1849
  3. 3481
  4. 7569
  5. 2601
  6. 6241
  7. 7056
  8. 3025
  9. 961
  10. 2401
  11. 1156
  12. 2916
  13. 9409
  14. 1296
  15. 7396
  16. 1444
  17. 2116
  18. 2209
  19. 1521
  20. 5476
  21. 1369
  22. 6889
  23. 3249
  24. 5929
  25. 1936
  26. 1024
  27. 6561
  28. 4489
  29. 1089
  30. 8281
  31. 6084
  32. 2809
  33. 8836
  34. 9604
  35. 5776
  36. 1764
  37. 3364
  38. 9216
  39. 9801
  40. 1225

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