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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 660 · 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. 1.53² =
  2. 2.52² =
  3. 3.48² =
  4. 4.75² =
  5. 5.96² =
  6. 6.49² =
  7. 7.94² =
  8. 8.36² =
  9. 9.41² =
  10. 10.61² =
  11. 11.76² =
  12. 12.56² =
  13. 13.47² =
  14. 14.81² =
  15. 15.92² =
  16. 16.98² =
  17. 17.67² =
  18. 18.42² =
  19. 19.82² =
  20. 20.32² =
  21. 21.73² =
  22. 22.71² =
  23. 23.78² =
  24. 24.44² =
  25. 25.46² =
  26. 26.88² =
  27. 27.59² =
  28. 28.93² =
  29. 29.83² =
  30. 30.87² =
  31. 31.37² =
  32. 32.51² =
  33. 33.45² =
  34. 34.91² =
  35. 35.55² =
  36. 36.63² =
  37. 37.33² =
  38. 38.65² =
  39. 39.77² =
  40. 40.79² =

Answer key

  1. 2809
  2. 2704
  3. 2304
  4. 5625
  5. 9216
  6. 2401
  7. 8836
  8. 1296
  9. 1681
  10. 3721
  11. 5776
  12. 3136
  13. 2209
  14. 6561
  15. 8464
  16. 9604
  17. 4489
  18. 1764
  19. 6724
  20. 1024
  21. 5329
  22. 5041
  23. 6084
  24. 1936
  25. 2116
  26. 7744
  27. 3481
  28. 8649
  29. 6889
  30. 7569
  31. 1369
  32. 2601
  33. 2025
  34. 8281
  35. 3025
  36. 3969
  37. 1089
  38. 4225
  39. 5929
  40. 6241

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