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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 535 · 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. 1.94² =
  2. 2.34² =
  3. 3.78² =
  4. 4.61² =
  5. 5.85² =
  6. 6.62² =
  7. 7.76² =
  8. 8.81² =
  9. 9.49² =
  10. 10.45² =
  11. 11.66² =
  12. 12.74² =
  13. 13.98² =
  14. 14.93² =
  15. 15.56² =
  16. 16.57² =
  17. 17.32² =
  18. 18.51² =
  19. 19.91² =
  20. 20.99² =
  21. 21.39² =
  22. 22.63² =
  23. 23.86² =
  24. 24.89² =
  25. 25.73² =
  26. 26.38² =
  27. 27.92² =
  28. 28.46² =
  29. 29.64² =
  30. 30.71² =
  31. 31.31² =
  32. 32.41² =
  33. 33.37² =
  34. 34.75² =
  35. 35.44² =
  36. 36.52² =
  37. 37.59² =
  38. 38.58² =
  39. 39.65² =
  40. 40.72² =

Answer key

  1. 8836
  2. 1156
  3. 6084
  4. 3721
  5. 7225
  6. 3844
  7. 5776
  8. 6561
  9. 2401
  10. 2025
  11. 4356
  12. 5476
  13. 9604
  14. 8649
  15. 3136
  16. 3249
  17. 1024
  18. 2601
  19. 8281
  20. 9801
  21. 1521
  22. 3969
  23. 7396
  24. 7921
  25. 5329
  26. 1444
  27. 8464
  28. 2116
  29. 4096
  30. 5041
  31. 961
  32. 1681
  33. 1369
  34. 5625
  35. 1936
  36. 2704
  37. 3481
  38. 3364
  39. 4225
  40. 5184

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