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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 202 · 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. 1.39² =
  2. 2.84² =
  3. 3.81² =
  4. 4.44² =
  5. 5.43² =
  6. 6.58² =
  7. 7.95² =
  8. 8.73² =
  9. 9.31² =
  10. 10.71² =
  11. 11.52² =
  12. 12.42² =
  13. 13.62² =
  14. 14.61² =
  15. 15.89² =
  16. 16.75² =
  17. 17.51² =
  18. 18.66² =
  19. 19.47² =
  20. 20.46² =
  21. 21.63² =
  22. 22.56² =
  23. 23.55² =
  24. 24.57² =
  25. 25.74² =
  26. 26.67² =
  27. 27.99² =
  28. 28.98² =
  29. 29.54² =
  30. 30.68² =
  31. 31.34² =
  32. 32.49² =
  33. 33.59² =
  34. 34.87² =
  35. 35.93² =
  36. 36.37² =
  37. 37.41² =
  38. 38.69² =
  39. 39.35² =
  40. 40.64² =

Answer key

  1. 1521
  2. 7056
  3. 6561
  4. 1936
  5. 1849
  6. 3364
  7. 9025
  8. 5329
  9. 961
  10. 5041
  11. 2704
  12. 1764
  13. 3844
  14. 3721
  15. 7921
  16. 5625
  17. 2601
  18. 4356
  19. 2209
  20. 2116
  21. 3969
  22. 3136
  23. 3025
  24. 3249
  25. 5476
  26. 4489
  27. 9801
  28. 9604
  29. 2916
  30. 4624
  31. 1156
  32. 2401
  33. 3481
  34. 7569
  35. 8649
  36. 1369
  37. 1681
  38. 4761
  39. 1225
  40. 4096

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