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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 228 · 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. 1.42² =
  2. 2.55² =
  3. 3.58² =
  4. 4.88² =
  5. 5.37² =
  6. 6.97² =
  7. 7.38² =
  8. 8.94² =
  9. 9.73² =
  10. 10.74² =
  11. 11.56² =
  12. 12.81² =
  13. 13.63² =
  14. 14.82² =
  15. 15.47² =
  16. 16.54² =
  17. 17.99² =
  18. 18.93² =
  19. 19.64² =
  20. 20.87² =
  21. 21.77² =
  22. 22.89² =
  23. 23.52² =
  24. 24.34² =
  25. 25.85² =
  26. 26.51² =
  27. 27.98² =
  28. 28.61² =
  29. 29.31² =
  30. 30.33² =
  31. 31.32² =
  32. 32.53² =
  33. 33.46² =
  34. 34.49² =
  35. 35.45² =
  36. 36.41² =
  37. 37.65² =
  38. 38.71² =
  39. 39.66² =
  40. 40.48² =

Answer key

  1. 1764
  2. 3025
  3. 3364
  4. 7744
  5. 1369
  6. 9409
  7. 1444
  8. 8836
  9. 5329
  10. 5476
  11. 3136
  12. 6561
  13. 3969
  14. 6724
  15. 2209
  16. 2916
  17. 9801
  18. 8649
  19. 4096
  20. 7569
  21. 5929
  22. 7921
  23. 2704
  24. 1156
  25. 7225
  26. 2601
  27. 9604
  28. 3721
  29. 961
  30. 1089
  31. 1024
  32. 2809
  33. 2116
  34. 2401
  35. 2025
  36. 1681
  37. 4225
  38. 5041
  39. 4356
  40. 2304

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