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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 112 · 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. 1.59² =
  2. 2.72² =
  3. 3.83² =
  4. 4.61² =
  5. 5.36² =
  6. 6.31² =
  7. 7.33² =
  8. 8.95² =
  9. 9.73² =
  10. 10.82² =
  11. 11.64² =
  12. 12.48² =
  13. 13.38² =
  14. 14.32² =
  15. 15.92² =
  16. 16.99² =
  17. 17.45² =
  18. 18.44² =
  19. 19.68² =
  20. 20.84² =
  21. 21.77² =
  22. 22.88² =
  23. 23.42² =
  24. 24.58² =
  25. 25.69² =
  26. 26.41² =
  27. 27.34² =
  28. 28.49² =
  29. 29.71² =
  30. 30.89² =
  31. 31.91² =
  32. 32.65² =
  33. 33.94² =
  34. 34.47² =
  35. 35.81² =
  36. 36.86² =
  37. 37.76² =
  38. 38.79² =
  39. 39.87² =
  40. 40.37² =

Answer key

  1. 3481
  2. 5184
  3. 6889
  4. 3721
  5. 1296
  6. 961
  7. 1089
  8. 9025
  9. 5329
  10. 6724
  11. 4096
  12. 2304
  13. 1444
  14. 1024
  15. 8464
  16. 9801
  17. 2025
  18. 1936
  19. 4624
  20. 7056
  21. 5929
  22. 7744
  23. 1764
  24. 3364
  25. 4761
  26. 1681
  27. 1156
  28. 2401
  29. 5041
  30. 7921
  31. 8281
  32. 4225
  33. 8836
  34. 2209
  35. 6561
  36. 7396
  37. 5776
  38. 6241
  39. 7569
  40. 1369

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