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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 423 · 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. 1.58² =
  2. 2.94² =
  3. 3.49² =
  4. 4.69² =
  5. 5.42² =
  6. 6.84² =
  7. 7.87² =
  8. 8.67² =
  9. 9.48² =
  10. 10.71² =
  11. 11.31² =
  12. 12.37² =
  13. 13.62² =
  14. 14.93² =
  15. 15.96² =
  16. 16.76² =
  17. 17.81² =
  18. 18.41² =
  19. 19.45² =
  20. 20.55² =
  21. 21.91² =
  22. 22.89² =
  23. 23.38² =
  24. 24.83² =
  25. 25.85² =
  26. 26.65² =
  27. 27.57² =
  28. 28.36² =
  29. 29.46² =
  30. 30.56² =
  31. 31.44² =
  32. 32.61² =
  33. 33.43² =
  34. 34.64² =
  35. 35.33² =
  36. 36.74² =
  37. 37.51² =
  38. 38.35² =
  39. 39.52² =
  40. 40.32² =

Answer key

  1. 3364
  2. 8836
  3. 2401
  4. 4761
  5. 1764
  6. 7056
  7. 7569
  8. 4489
  9. 2304
  10. 5041
  11. 961
  12. 1369
  13. 3844
  14. 8649
  15. 9216
  16. 5776
  17. 6561
  18. 1681
  19. 2025
  20. 3025
  21. 8281
  22. 7921
  23. 1444
  24. 6889
  25. 7225
  26. 4225
  27. 3249
  28. 1296
  29. 2116
  30. 3136
  31. 1936
  32. 3721
  33. 1849
  34. 4096
  35. 1089
  36. 5476
  37. 2601
  38. 1225
  39. 2704
  40. 1024

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