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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 240 · 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. 1.86² =
  2. 2.61² =
  3. 3.69² =
  4. 4.93² =
  5. 5.66² =
  6. 6.65² =
  7. 7.71² =
  8. 8.42² =
  9. 9.85² =
  10. 10.47² =
  11. 11.46² =
  12. 12.35² =
  13. 13.53² =
  14. 14.81² =
  15. 15.54² =
  16. 16.49² =
  17. 17.97² =
  18. 18.51² =
  19. 19.94² =
  20. 20.75² =
  21. 21.38² =
  22. 22.52² =
  23. 23.48² =
  24. 24.58² =
  25. 25.59² =
  26. 26.36² =
  27. 27.68² =
  28. 28.78² =
  29. 29.34² =
  30. 30.95² =
  31. 31.31² =
  32. 32.43² =
  33. 33.44² =
  34. 34.89² =
  35. 35.99² =
  36. 36.56² =
  37. 37.83² =
  38. 38.74² =
  39. 39.63² =
  40. 40.39² =

Answer key

  1. 7396
  2. 3721
  3. 4761
  4. 8649
  5. 4356
  6. 4225
  7. 5041
  8. 1764
  9. 7225
  10. 2209
  11. 2116
  12. 1225
  13. 2809
  14. 6561
  15. 2916
  16. 2401
  17. 9409
  18. 2601
  19. 8836
  20. 5625
  21. 1444
  22. 2704
  23. 2304
  24. 3364
  25. 3481
  26. 1296
  27. 4624
  28. 6084
  29. 1156
  30. 9025
  31. 961
  32. 1849
  33. 1936
  34. 7921
  35. 9801
  36. 3136
  37. 6889
  38. 5476
  39. 3969
  40. 1521

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