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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 332 · 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. 1.78² =
  2. 2.85² =
  3. 3.92² =
  4. 4.61² =
  5. 5.59² =
  6. 6.47² =
  7. 7.89² =
  8. 8.56² =
  9. 9.51² =
  10. 10.34² =
  11. 11.63² =
  12. 12.65² =
  13. 13.81² =
  14. 14.38² =
  15. 15.99² =
  16. 16.87² =
  17. 17.71² =
  18. 18.58² =
  19. 19.72² =
  20. 20.45² =
  21. 21.88² =
  22. 22.73² =
  23. 23.39² =
  24. 24.86² =
  25. 25.64² =
  26. 26.32² =
  27. 27.67² =
  28. 28.33² =
  29. 29.97² =
  30. 30.93² =
  31. 31.69² =
  32. 32.49² =
  33. 33.83² =
  34. 34.77² =
  35. 35.68² =
  36. 36.44² =
  37. 37.41² =
  38. 38.76² =
  39. 39.55² =
  40. 40.79² =

Answer key

  1. 6084
  2. 7225
  3. 8464
  4. 3721
  5. 3481
  6. 2209
  7. 7921
  8. 3136
  9. 2601
  10. 1156
  11. 3969
  12. 4225
  13. 6561
  14. 1444
  15. 9801
  16. 7569
  17. 5041
  18. 3364
  19. 5184
  20. 2025
  21. 7744
  22. 5329
  23. 1521
  24. 7396
  25. 4096
  26. 1024
  27. 4489
  28. 1089
  29. 9409
  30. 8649
  31. 4761
  32. 2401
  33. 6889
  34. 5929
  35. 4624
  36. 1936
  37. 1681
  38. 5776
  39. 3025
  40. 6241

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