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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 674 · 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. 2.91² =
  3. 3.61² =
  4. 4.45² =
  5. 5.79² =
  6. 6.82² =
  7. 7.92² =
  8. 8.87² =
  9. 9.63² =
  10. 10.81² =
  11. 11.69² =
  12. 12.89² =
  13. 13.48² =
  14. 14.98² =
  15. 15.46² =
  16. 16.44² =
  17. 17.51² =
  18. 18.41² =
  19. 19.76² =
  20. 20.65² =
  21. 21.43² =
  22. 22.34² =
  23. 23.66² =
  24. 24.88² =
  25. 25.96² =
  26. 26.62² =
  27. 27.31² =
  28. 28.84² =
  29. 29.73² =
  30. 30.58² =
  31. 31.35² =
  32. 32.71² =
  33. 33.93² =
  34. 34.32² =
  35. 35.77² =
  36. 36.94² =
  37. 37.42² =
  38. 38.37² =
  39. 39.55² =
  40. 40.85² =

Answer key

  1. 9801
  2. 8281
  3. 3721
  4. 2025
  5. 6241
  6. 6724
  7. 8464
  8. 7569
  9. 3969
  10. 6561
  11. 4761
  12. 7921
  13. 2304
  14. 9604
  15. 2116
  16. 1936
  17. 2601
  18. 1681
  19. 5776
  20. 4225
  21. 1849
  22. 1156
  23. 4356
  24. 7744
  25. 9216
  26. 3844
  27. 961
  28. 7056
  29. 5329
  30. 3364
  31. 1225
  32. 5041
  33. 8649
  34. 1024
  35. 5929
  36. 8836
  37. 1764
  38. 1369
  39. 3025
  40. 7225

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