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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 47 · 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. 1.44² =
  2. 2.62² =
  3. 3.97² =
  4. 4.57² =
  5. 5.46² =
  6. 6.65² =
  7. 7.73² =
  8. 8.68² =
  9. 9.53² =
  10. 10.95² =
  11. 11.48² =
  12. 12.58² =
  13. 13.42² =
  14. 14.96² =
  15. 15.88² =
  16. 16.94² =
  17. 17.99² =
  18. 18.93² =
  19. 19.98² =
  20. 20.55² =
  21. 21.71² =
  22. 22.37² =
  23. 23.31² =
  24. 24.84² =
  25. 25.85² =
  26. 26.76² =
  27. 27.41² =
  28. 28.82² =
  29. 29.81² =
  30. 30.78² =
  31. 31.52² =
  32. 32.43² =
  33. 33.56² =
  34. 34.61² =
  35. 35.51² =
  36. 36.89² =
  37. 37.63² =
  38. 38.39² =
  39. 39.91² =
  40. 40.86² =

Answer key

  1. 1936
  2. 3844
  3. 9409
  4. 3249
  5. 2116
  6. 4225
  7. 5329
  8. 4624
  9. 2809
  10. 9025
  11. 2304
  12. 3364
  13. 1764
  14. 9216
  15. 7744
  16. 8836
  17. 9801
  18. 8649
  19. 9604
  20. 3025
  21. 5041
  22. 1369
  23. 961
  24. 7056
  25. 7225
  26. 5776
  27. 1681
  28. 6724
  29. 6561
  30. 6084
  31. 2704
  32. 1849
  33. 3136
  34. 3721
  35. 2601
  36. 7921
  37. 3969
  38. 1521
  39. 8281
  40. 7396

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