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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 369 · 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. 1.42² =
  2. 2.73² =
  3. 3.61² =
  4. 4.34² =
  5. 5.32² =
  6. 6.37² =
  7. 7.65² =
  8. 8.77² =
  9. 9.76² =
  10. 10.87² =
  11. 11.98² =
  12. 12.59² =
  13. 13.64² =
  14. 14.94² =
  15. 15.31² =
  16. 16.33² =
  17. 17.47² =
  18. 18.89² =
  19. 19.83² =
  20. 20.84² =
  21. 21.99² =
  22. 22.95² =
  23. 23.39² =
  24. 24.91² =
  25. 25.52² =
  26. 26.82² =
  27. 27.93² =
  28. 28.69² =
  29. 29.71² =
  30. 30.96² =
  31. 31.62² =
  32. 32.58² =
  33. 33.74² =
  34. 34.51² =
  35. 35.97² =
  36. 36.68² =
  37. 37.81² =
  38. 38.67² =
  39. 39.38² =
  40. 40.56² =

Answer key

  1. 1764
  2. 5329
  3. 3721
  4. 1156
  5. 1024
  6. 1369
  7. 4225
  8. 5929
  9. 5776
  10. 7569
  11. 9604
  12. 3481
  13. 4096
  14. 8836
  15. 961
  16. 1089
  17. 2209
  18. 7921
  19. 6889
  20. 7056
  21. 9801
  22. 9025
  23. 1521
  24. 8281
  25. 2704
  26. 6724
  27. 8649
  28. 4761
  29. 5041
  30. 9216
  31. 3844
  32. 3364
  33. 5476
  34. 2601
  35. 9409
  36. 4624
  37. 6561
  38. 4489
  39. 1444
  40. 3136

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