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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 49 · 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. 1.44² =
  2. 2.63² =
  3. 3.31² =
  4. 4.42² =
  5. 5.49² =
  6. 6.45² =
  7. 7.94² =
  8. 8.59² =
  9. 9.99² =
  10. 10.62² =
  11. 11.36² =
  12. 12.71² =
  13. 13.34² =
  14. 14.98² =
  15. 15.66² =
  16. 16.32² =
  17. 17.61² =
  18. 18.88² =
  19. 19.41² =
  20. 20.57² =
  21. 21.46² =
  22. 22.74² =
  23. 23.81² =
  24. 24.56² =
  25. 25.38² =
  26. 26.75² =
  27. 27.87² =
  28. 28.95² =
  29. 29.84² =
  30. 30.67² =
  31. 31.76² =
  32. 32.78² =
  33. 33.51² =
  34. 34.86² =
  35. 35.77² =
  36. 36.92² =
  37. 37.47² =
  38. 38.37² =
  39. 39.73² =
  40. 40.39² =

Answer key

  1. 1936
  2. 3969
  3. 961
  4. 1764
  5. 2401
  6. 2025
  7. 8836
  8. 3481
  9. 9801
  10. 3844
  11. 1296
  12. 5041
  13. 1156
  14. 9604
  15. 4356
  16. 1024
  17. 3721
  18. 7744
  19. 1681
  20. 3249
  21. 2116
  22. 5476
  23. 6561
  24. 3136
  25. 1444
  26. 5625
  27. 7569
  28. 9025
  29. 7056
  30. 4489
  31. 5776
  32. 6084
  33. 2601
  34. 7396
  35. 5929
  36. 8464
  37. 2209
  38. 1369
  39. 5329
  40. 1521

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