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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 25 · 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. 1.95² =
  2. 2.88² =
  3. 3.75² =
  4. 4.91² =
  5. 5.73² =
  6. 6.34² =
  7. 7.66² =
  8. 8.42² =
  9. 9.56² =
  10. 10.51² =
  11. 11.84² =
  12. 12.87² =
  13. 13.64² =
  14. 14.71² =
  15. 15.78² =
  16. 16.97² =
  17. 17.54² =
  18. 18.81² =
  19. 19.38² =
  20. 20.44² =
  21. 21.82² =
  22. 22.74² =
  23. 23.67² =
  24. 24.83² =
  25. 25.32² =
  26. 26.86² =
  27. 27.31² =
  28. 28.89² =
  29. 29.92² =
  30. 30.76² =
  31. 31.62² =
  32. 32.39² =
  33. 33.41² =
  34. 34.77² =
  35. 35.46² =
  36. 36.52² =
  37. 37.93² =
  38. 38.72² =
  39. 39.55² =
  40. 40.59² =

Answer key

  1. 9025
  2. 7744
  3. 5625
  4. 8281
  5. 5329
  6. 1156
  7. 4356
  8. 1764
  9. 3136
  10. 2601
  11. 7056
  12. 7569
  13. 4096
  14. 5041
  15. 6084
  16. 9409
  17. 2916
  18. 6561
  19. 1444
  20. 1936
  21. 6724
  22. 5476
  23. 4489
  24. 6889
  25. 1024
  26. 7396
  27. 961
  28. 7921
  29. 8464
  30. 5776
  31. 3844
  32. 1521
  33. 1681
  34. 5929
  35. 2116
  36. 2704
  37. 8649
  38. 5184
  39. 3025
  40. 3481

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