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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 391 · 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. 1.99² =
  2. 2.81² =
  3. 3.87² =
  4. 4.74² =
  5. 5.76² =
  6. 6.69² =
  7. 7.34² =
  8. 8.77² =
  9. 9.53² =
  10. 10.65² =
  11. 11.37² =
  12. 12.51² =
  13. 13.82² =
  14. 14.93² =
  15. 15.89² =
  16. 16.57² =
  17. 17.32² =
  18. 18.56² =
  19. 19.73² =
  20. 20.31² =
  21. 21.86² =
  22. 22.91² =
  23. 23.75² =
  24. 24.79² =
  25. 25.54² =
  26. 26.38² =
  27. 27.83² =
  28. 28.33² =
  29. 29.42² =
  30. 30.88² =
  31. 31.41² =
  32. 32.35² =
  33. 33.71² =
  34. 34.39² =
  35. 35.61² =
  36. 36.98² =
  37. 37.45² =
  38. 38.97² =
  39. 39.48² =
  40. 40.58² =

Answer key

  1. 9801
  2. 6561
  3. 7569
  4. 5476
  5. 5776
  6. 4761
  7. 1156
  8. 5929
  9. 2809
  10. 4225
  11. 1369
  12. 2601
  13. 6724
  14. 8649
  15. 7921
  16. 3249
  17. 1024
  18. 3136
  19. 5329
  20. 961
  21. 7396
  22. 8281
  23. 5625
  24. 6241
  25. 2916
  26. 1444
  27. 6889
  28. 1089
  29. 1764
  30. 7744
  31. 1681
  32. 1225
  33. 5041
  34. 1521
  35. 3721
  36. 9604
  37. 2025
  38. 9409
  39. 2304
  40. 3364

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