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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 743 · 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. 1.95² =
  2. 2.81² =
  3. 3.61² =
  4. 4.74² =
  5. 5.68² =
  6. 6.35² =
  7. 7.94² =
  8. 8.83² =
  9. 9.56² =
  10. 10.53² =
  11. 11.91² =
  12. 12.72² =
  13. 13.65² =
  14. 14.93² =
  15. 15.39² =
  16. 16.32² =
  17. 17.64² =
  18. 18.82² =
  19. 19.96² =
  20. 20.67² =
  21. 21.52² =
  22. 22.31² =
  23. 23.84² =
  24. 24.57² =
  25. 25.87² =
  26. 26.63² =
  27. 27.51² =
  28. 28.38² =
  29. 29.71² =
  30. 30.89² =
  31. 31.77² =
  32. 32.34² =
  33. 33.44² =
  34. 34.98² =
  35. 35.37² =
  36. 36.54² =
  37. 37.49² =
  38. 38.73² =
  39. 39.66² =
  40. 40.75² =

Answer key

  1. 9025
  2. 6561
  3. 3721
  4. 5476
  5. 4624
  6. 1225
  7. 8836
  8. 6889
  9. 3136
  10. 2809
  11. 8281
  12. 5184
  13. 4225
  14. 8649
  15. 1521
  16. 1024
  17. 4096
  18. 6724
  19. 9216
  20. 4489
  21. 2704
  22. 961
  23. 7056
  24. 3249
  25. 7569
  26. 3969
  27. 2601
  28. 1444
  29. 5041
  30. 7921
  31. 5929
  32. 1156
  33. 1936
  34. 9604
  35. 1369
  36. 2916
  37. 2401
  38. 5329
  39. 4356
  40. 5625

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