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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 201 · 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. 1.49² =
  2. 2.31² =
  3. 3.97² =
  4. 4.99² =
  5. 5.48² =
  6. 6.69² =
  7. 7.71² =
  8. 8.91² =
  9. 9.58² =
  10. 10.45² =
  11. 11.68² =
  12. 12.63² =
  13. 13.46² =
  14. 14.41² =
  15. 15.43² =
  16. 16.42² =
  17. 17.81² =
  18. 18.55² =
  19. 19.57² =
  20. 20.67² =
  21. 21.51² =
  22. 22.95² =
  23. 23.52² =
  24. 24.36² =
  25. 25.39² =
  26. 26.73² =
  27. 27.66² =
  28. 28.76² =
  29. 29.96² =
  30. 30.98² =
  31. 31.56² =
  32. 32.44² =
  33. 33.83² =
  34. 34.85² =
  35. 35.59² =
  36. 36.61² =
  37. 37.47² =
  38. 38.75² =
  39. 39.35² =
  40. 40.93² =

Answer key

  1. 2401
  2. 961
  3. 9409
  4. 9801
  5. 2304
  6. 4761
  7. 5041
  8. 8281
  9. 3364
  10. 2025
  11. 4624
  12. 3969
  13. 2116
  14. 1681
  15. 1849
  16. 1764
  17. 6561
  18. 3025
  19. 3249
  20. 4489
  21. 2601
  22. 9025
  23. 2704
  24. 1296
  25. 1521
  26. 5329
  27. 4356
  28. 5776
  29. 9216
  30. 9604
  31. 3136
  32. 1936
  33. 6889
  34. 7225
  35. 3481
  36. 3721
  37. 2209
  38. 5625
  39. 1225
  40. 8649

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