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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 564 · 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. 1.48² =
  2. 2.86² =
  3. 3.99² =
  4. 4.47² =
  5. 5.41² =
  6. 6.53² =
  7. 7.49² =
  8. 8.34² =
  9. 9.54² =
  10. 10.59² =
  11. 11.32² =
  12. 12.71² =
  13. 13.38² =
  14. 14.74² =
  15. 15.56² =
  16. 16.67² =
  17. 17.57² =
  18. 18.79² =
  19. 19.89² =
  20. 20.91² =
  21. 21.87² =
  22. 22.58² =
  23. 23.51² =
  24. 24.31² =
  25. 25.61² =
  26. 26.78² =
  27. 27.72² =
  28. 28.94² =
  29. 29.43² =
  30. 30.42² =
  31. 31.82² =
  32. 32.39² =
  33. 33.96² =
  34. 34.95² =
  35. 35.77² =
  36. 36.75² =
  37. 37.76² =
  38. 38.85² =
  39. 39.36² =
  40. 40.81² =

Answer key

  1. 2304
  2. 7396
  3. 9801
  4. 2209
  5. 1681
  6. 2809
  7. 2401
  8. 1156
  9. 2916
  10. 3481
  11. 1024
  12. 5041
  13. 1444
  14. 5476
  15. 3136
  16. 4489
  17. 3249
  18. 6241
  19. 7921
  20. 8281
  21. 7569
  22. 3364
  23. 2601
  24. 961
  25. 3721
  26. 6084
  27. 5184
  28. 8836
  29. 1849
  30. 1764
  31. 6724
  32. 1521
  33. 9216
  34. 9025
  35. 5929
  36. 5625
  37. 5776
  38. 7225
  39. 1296
  40. 6561

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