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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 79 · 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. 1.54² =
  2. 2.32² =
  3. 3.65² =
  4. 4.79² =
  5. 5.52² =
  6. 6.99² =
  7. 7.89² =
  8. 8.63² =
  9. 9.74² =
  10. 10.42² =
  11. 11.38² =
  12. 12.91² =
  13. 13.37² =
  14. 14.61² =
  15. 15.66² =
  16. 16.95² =
  17. 17.55² =
  18. 18.92² =
  19. 19.49² =
  20. 20.33² =
  21. 21.77² =
  22. 22.39² =
  23. 23.34² =
  24. 24.72² =
  25. 25.41² =
  26. 26.64² =
  27. 27.44² =
  28. 28.31² =
  29. 29.83² =
  30. 30.59² =
  31. 31.71² =
  32. 32.62² =
  33. 33.96² =
  34. 34.98² =
  35. 35.93² =
  36. 36.35² =
  37. 37.56² =
  38. 38.81² =
  39. 39.69² =
  40. 40.51² =

Answer key

  1. 2916
  2. 1024
  3. 4225
  4. 6241
  5. 2704
  6. 9801
  7. 7921
  8. 3969
  9. 5476
  10. 1764
  11. 1444
  12. 8281
  13. 1369
  14. 3721
  15. 4356
  16. 9025
  17. 3025
  18. 8464
  19. 2401
  20. 1089
  21. 5929
  22. 1521
  23. 1156
  24. 5184
  25. 1681
  26. 4096
  27. 1936
  28. 961
  29. 6889
  30. 3481
  31. 5041
  32. 3844
  33. 9216
  34. 9604
  35. 8649
  36. 1225
  37. 3136
  38. 6561
  39. 4761
  40. 2601

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