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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 249 · 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. 1.53² =
  2. 2.44² =
  3. 3.66² =
  4. 4.56² =
  5. 5.95² =
  6. 6.55² =
  7. 7.73² =
  8. 8.71² =
  9. 9.62² =
  10. 10.58² =
  11. 11.83² =
  12. 12.68² =
  13. 13.78² =
  14. 14.63² =
  15. 15.79² =
  16. 16.93² =
  17. 17.84² =
  18. 18.77² =
  19. 19.57² =
  20. 20.51² =
  21. 21.46² =
  22. 22.74² =
  23. 23.42² =
  24. 24.37² =
  25. 25.38² =
  26. 26.54² =
  27. 27.31² =
  28. 28.92² =
  29. 29.98² =
  30. 30.64² =
  31. 31.45² =
  32. 32.86² =
  33. 33.67² =
  34. 34.75² =
  35. 35.76² =
  36. 36.47² =
  37. 37.36² =
  38. 38.61² =
  39. 39.41² =
  40. 40.35² =

Answer key

  1. 2809
  2. 1936
  3. 4356
  4. 3136
  5. 9025
  6. 3025
  7. 5329
  8. 5041
  9. 3844
  10. 3364
  11. 6889
  12. 4624
  13. 6084
  14. 3969
  15. 6241
  16. 8649
  17. 7056
  18. 5929
  19. 3249
  20. 2601
  21. 2116
  22. 5476
  23. 1764
  24. 1369
  25. 1444
  26. 2916
  27. 961
  28. 8464
  29. 9604
  30. 4096
  31. 2025
  32. 7396
  33. 4489
  34. 5625
  35. 5776
  36. 2209
  37. 1296
  38. 3721
  39. 1681
  40. 1225

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