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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 121 · 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. 1.71² =
  2. 2.47² =
  3. 3.58² =
  4. 4.98² =
  5. 5.81² =
  6. 6.76² =
  7. 7.97² =
  8. 8.85² =
  9. 9.42² =
  10. 10.67² =
  11. 11.69² =
  12. 12.46² =
  13. 13.41² =
  14. 14.57² =
  15. 15.35² =
  16. 16.55² =
  17. 17.45² =
  18. 18.93² =
  19. 19.44² =
  20. 20.34² =
  21. 21.73² =
  22. 22.74² =
  23. 23.37² =
  24. 24.66² =
  25. 25.77² =
  26. 26.82² =
  27. 27.61² =
  28. 28.78² =
  29. 29.62² =
  30. 30.39² =
  31. 31.31² =
  32. 32.49² =
  33. 33.94² =
  34. 34.87² =
  35. 35.56² =
  36. 36.95² =
  37. 37.91² =
  38. 38.68² =
  39. 39.99² =
  40. 40.43² =

Answer key

  1. 5041
  2. 2209
  3. 3364
  4. 9604
  5. 6561
  6. 5776
  7. 9409
  8. 7225
  9. 1764
  10. 4489
  11. 4761
  12. 2116
  13. 1681
  14. 3249
  15. 1225
  16. 3025
  17. 2025
  18. 8649
  19. 1936
  20. 1156
  21. 5329
  22. 5476
  23. 1369
  24. 4356
  25. 5929
  26. 6724
  27. 3721
  28. 6084
  29. 3844
  30. 1521
  31. 961
  32. 2401
  33. 8836
  34. 7569
  35. 3136
  36. 9025
  37. 8281
  38. 4624
  39. 9801
  40. 1849

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