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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 329 · 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. 1.52² =
  2. 2.94² =
  3. 3.36² =
  4. 4.45² =
  5. 5.97² =
  6. 6.63² =
  7. 7.56² =
  8. 8.32² =
  9. 9.51² =
  10. 10.91² =
  11. 11.37² =
  12. 12.38² =
  13. 13.72² =
  14. 14.39² =
  15. 15.68² =
  16. 16.93² =
  17. 17.42² =
  18. 18.67² =
  19. 19.49² =
  20. 20.88² =
  21. 21.89² =
  22. 22.71² =
  23. 23.59² =
  24. 24.83² =
  25. 25.74² =
  26. 26.35² =
  27. 27.44² =
  28. 28.77² =
  29. 29.64² =
  30. 30.41² =
  31. 31.95² =
  32. 32.61² =
  33. 33.47² =
  34. 34.57² =
  35. 35.58² =
  36. 36.73² =
  37. 37.48² =
  38. 38.82² =
  39. 39.76² =
  40. 40.34² =

Answer key

  1. 2704
  2. 8836
  3. 1296
  4. 2025
  5. 9409
  6. 3969
  7. 3136
  8. 1024
  9. 2601
  10. 8281
  11. 1369
  12. 1444
  13. 5184
  14. 1521
  15. 4624
  16. 8649
  17. 1764
  18. 4489
  19. 2401
  20. 7744
  21. 7921
  22. 5041
  23. 3481
  24. 6889
  25. 5476
  26. 1225
  27. 1936
  28. 5929
  29. 4096
  30. 1681
  31. 9025
  32. 3721
  33. 2209
  34. 3249
  35. 3364
  36. 5329
  37. 2304
  38. 6724
  39. 5776
  40. 1156

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