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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 692 · 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. 1.36² =
  2. 2.82² =
  3. 3.75² =
  4. 4.63² =
  5. 5.98² =
  6. 6.86² =
  7. 7.45² =
  8. 8.99² =
  9. 9.38² =
  10. 10.67² =
  11. 11.85² =
  12. 12.43² =
  13. 13.73² =
  14. 14.37² =
  15. 15.51² =
  16. 16.87² =
  17. 17.78² =
  18. 18.35² =
  19. 19.47² =
  20. 20.81² =
  21. 21.91² =
  22. 22.31² =
  23. 23.95² =
  24. 24.94² =
  25. 25.89² =
  26. 26.46² =
  27. 27.71² =
  28. 28.34² =
  29. 29.64² =
  30. 30.62² =
  31. 31.42² =
  32. 32.44² =
  33. 33.92² =
  34. 34.49² =
  35. 35.56² =
  36. 36.57² =
  37. 37.93² =
  38. 38.97² =
  39. 39.66² =
  40. 40.79² =

Answer key

  1. 1296
  2. 6724
  3. 5625
  4. 3969
  5. 9604
  6. 7396
  7. 2025
  8. 9801
  9. 1444
  10. 4489
  11. 7225
  12. 1849
  13. 5329
  14. 1369
  15. 2601
  16. 7569
  17. 6084
  18. 1225
  19. 2209
  20. 6561
  21. 8281
  22. 961
  23. 9025
  24. 8836
  25. 7921
  26. 2116
  27. 5041
  28. 1156
  29. 4096
  30. 3844
  31. 1764
  32. 1936
  33. 8464
  34. 2401
  35. 3136
  36. 3249
  37. 8649
  38. 9409
  39. 4356
  40. 6241

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