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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 665 · 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. 2.44² =
  3. 3.47² =
  4. 4.51² =
  5. 5.73² =
  6. 6.66² =
  7. 7.65² =
  8. 8.46² =
  9. 9.32² =
  10. 10.69² =
  11. 11.42² =
  12. 12.95² =
  13. 13.61² =
  14. 14.34² =
  15. 15.62² =
  16. 16.58² =
  17. 17.87² =
  18. 18.38² =
  19. 19.56² =
  20. 20.85² =
  21. 21.55² =
  22. 22.97² =
  23. 23.53² =
  24. 24.52² =
  25. 25.35² =
  26. 26.41² =
  27. 27.36² =
  28. 28.39² =
  29. 29.76² =
  30. 30.74² =
  31. 31.88² =
  32. 32.63² =
  33. 33.33² =
  34. 34.48² =
  35. 35.81² =
  36. 36.99² =
  37. 37.77² =
  38. 38.78² =
  39. 39.96² =
  40. 40.91² =

Answer key

  1. 5041
  2. 1936
  3. 2209
  4. 2601
  5. 5329
  6. 4356
  7. 4225
  8. 2116
  9. 1024
  10. 4761
  11. 1764
  12. 9025
  13. 3721
  14. 1156
  15. 3844
  16. 3364
  17. 7569
  18. 1444
  19. 3136
  20. 7225
  21. 3025
  22. 9409
  23. 2809
  24. 2704
  25. 1225
  26. 1681
  27. 1296
  28. 1521
  29. 5776
  30. 5476
  31. 7744
  32. 3969
  33. 1089
  34. 2304
  35. 6561
  36. 9801
  37. 5929
  38. 6084
  39. 9216
  40. 8281

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