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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 691 · 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. 1.94² =
  2. 2.93² =
  3. 3.35² =
  4. 4.33² =
  5. 5.42² =
  6. 6.58² =
  7. 7.69² =
  8. 8.83² =
  9. 9.47² =
  10. 10.48² =
  11. 11.32² =
  12. 12.63² =
  13. 13.53² =
  14. 14.46² =
  15. 15.91² =
  16. 16.99² =
  17. 17.43² =
  18. 18.88² =
  19. 19.61² =
  20. 20.56² =
  21. 21.73² =
  22. 22.71² =
  23. 23.44² =
  24. 24.49² =
  25. 25.51² =
  26. 26.67² =
  27. 27.77² =
  28. 28.41² =
  29. 29.45² =
  30. 30.68² =
  31. 31.74² =
  32. 32.75² =
  33. 33.79² =
  34. 34.34² =
  35. 35.55² =
  36. 36.98² =
  37. 37.87² =
  38. 38.76² =
  39. 39.37² =
  40. 40.65² =

Answer key

  1. 8836
  2. 8649
  3. 1225
  4. 1089
  5. 1764
  6. 3364
  7. 4761
  8. 6889
  9. 2209
  10. 2304
  11. 1024
  12. 3969
  13. 2809
  14. 2116
  15. 8281
  16. 9801
  17. 1849
  18. 7744
  19. 3721
  20. 3136
  21. 5329
  22. 5041
  23. 1936
  24. 2401
  25. 2601
  26. 4489
  27. 5929
  28. 1681
  29. 2025
  30. 4624
  31. 5476
  32. 5625
  33. 6241
  34. 1156
  35. 3025
  36. 9604
  37. 7569
  38. 5776
  39. 1369
  40. 4225

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