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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 91 · 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. 1.83² =
  2. 2.33² =
  3. 3.41² =
  4. 4.56² =
  5. 5.31² =
  6. 6.93² =
  7. 7.71² =
  8. 8.55² =
  9. 9.96² =
  10. 10.42² =
  11. 11.97² =
  12. 12.52² =
  13. 13.51² =
  14. 14.79² =
  15. 15.94² =
  16. 16.58² =
  17. 17.74² =
  18. 18.84² =
  19. 19.87² =
  20. 20.62² =
  21. 21.86² =
  22. 22.38² =
  23. 23.72² =
  24. 24.57² =
  25. 25.48² =
  26. 26.81² =
  27. 27.66² =
  28. 28.75² =
  29. 29.65² =
  30. 30.76² =
  31. 31.88² =
  32. 32.99² =
  33. 33.54² =
  34. 34.69² =
  35. 35.61² =
  36. 36.91² =
  37. 37.37² =
  38. 38.36² =
  39. 39.77² =
  40. 40.89² =

Answer key

  1. 6889
  2. 1089
  3. 1681
  4. 3136
  5. 961
  6. 8649
  7. 5041
  8. 3025
  9. 9216
  10. 1764
  11. 9409
  12. 2704
  13. 2601
  14. 6241
  15. 8836
  16. 3364
  17. 5476
  18. 7056
  19. 7569
  20. 3844
  21. 7396
  22. 1444
  23. 5184
  24. 3249
  25. 2304
  26. 6561
  27. 4356
  28. 5625
  29. 4225
  30. 5776
  31. 7744
  32. 9801
  33. 2916
  34. 4761
  35. 3721
  36. 8281
  37. 1369
  38. 1296
  39. 5929
  40. 7921

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