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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 466 · 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. 1.66² =
  2. 2.51² =
  3. 3.71² =
  4. 4.39² =
  5. 5.32² =
  6. 6.52² =
  7. 7.84² =
  8. 8.64² =
  9. 9.81² =
  10. 10.69² =
  11. 11.31² =
  12. 12.38² =
  13. 13.95² =
  14. 14.72² =
  15. 15.41² =
  16. 16.35² =
  17. 17.91² =
  18. 18.45² =
  19. 19.34² =
  20. 20.87² =
  21. 21.96² =
  22. 22.59² =
  23. 23.33² =
  24. 24.49² =
  25. 25.82² =
  26. 26.68² =
  27. 27.36² =
  28. 28.62² =
  29. 29.76² =
  30. 30.65² =
  31. 31.98² =
  32. 32.56² =
  33. 33.83² =
  34. 34.55² =
  35. 35.57² =
  36. 36.44² =
  37. 37.99² =
  38. 38.53² =
  39. 39.61² =
  40. 40.93² =

Answer key

  1. 4356
  2. 2601
  3. 5041
  4. 1521
  5. 1024
  6. 2704
  7. 7056
  8. 4096
  9. 6561
  10. 4761
  11. 961
  12. 1444
  13. 9025
  14. 5184
  15. 1681
  16. 1225
  17. 8281
  18. 2025
  19. 1156
  20. 7569
  21. 9216
  22. 3481
  23. 1089
  24. 2401
  25. 6724
  26. 4624
  27. 1296
  28. 3844
  29. 5776
  30. 4225
  31. 9604
  32. 3136
  33. 6889
  34. 3025
  35. 3249
  36. 1936
  37. 9801
  38. 2809
  39. 3721
  40. 8649

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