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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 440 · 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. 1.45² =
  2. 2.95² =
  3. 3.51² =
  4. 4.74² =
  5. 5.46² =
  6. 6.39² =
  7. 7.56² =
  8. 8.41² =
  9. 9.31² =
  10. 10.98² =
  11. 11.63² =
  12. 12.88² =
  13. 13.99² =
  14. 14.62² =
  15. 15.91² =
  16. 16.92² =
  17. 17.44² =
  18. 18.78² =
  19. 19.71² =
  20. 20.37² =
  21. 21.52² =
  22. 22.61² =
  23. 23.82² =
  24. 24.65² =
  25. 25.81² =
  26. 26.58² =
  27. 27.36² =
  28. 28.84² =
  29. 29.42² =
  30. 30.94² =
  31. 31.38² =
  32. 32.69² =
  33. 33.77² =
  34. 34.33² =
  35. 35.87² =
  36. 36.76² =
  37. 37.32² =
  38. 38.66² =
  39. 39.34² =
  40. 40.85² =

Answer key

  1. 2025
  2. 9025
  3. 2601
  4. 5476
  5. 2116
  6. 1521
  7. 3136
  8. 1681
  9. 961
  10. 9604
  11. 3969
  12. 7744
  13. 9801
  14. 3844
  15. 8281
  16. 8464
  17. 1936
  18. 6084
  19. 5041
  20. 1369
  21. 2704
  22. 3721
  23. 6724
  24. 4225
  25. 6561
  26. 3364
  27. 1296
  28. 7056
  29. 1764
  30. 8836
  31. 1444
  32. 4761
  33. 5929
  34. 1089
  35. 7569
  36. 5776
  37. 1024
  38. 4356
  39. 1156
  40. 7225

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