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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 8 · 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. 1.64² =
  2. 2.39² =
  3. 3.81² =
  4. 4.71² =
  5. 5.95² =
  6. 6.66² =
  7. 7.34² =
  8. 8.51² =
  9. 9.35² =
  10. 10.36² =
  11. 11.79² =
  12. 12.99² =
  13. 13.68² =
  14. 14.62² =
  15. 15.44² =
  16. 16.58² =
  17. 17.56² =
  18. 18.82² =
  19. 19.33² =
  20. 20.88² =
  21. 21.52² =
  22. 22.45² =
  23. 23.61² =
  24. 24.83² =
  25. 25.85² =
  26. 26.98² =
  27. 27.65² =
  28. 28.41² =
  29. 29.76² =
  30. 30.47² =
  31. 31.32² =
  32. 32.78² =
  33. 33.91² =
  34. 34.97² =
  35. 35.31² =
  36. 36.92² =
  37. 37.87² =
  38. 38.94² =
  39. 39.73² =
  40. 40.96² =

Answer key

  1. 4096
  2. 1521
  3. 6561
  4. 5041
  5. 9025
  6. 4356
  7. 1156
  8. 2601
  9. 1225
  10. 1296
  11. 6241
  12. 9801
  13. 4624
  14. 3844
  15. 1936
  16. 3364
  17. 3136
  18. 6724
  19. 1089
  20. 7744
  21. 2704
  22. 2025
  23. 3721
  24. 6889
  25. 7225
  26. 9604
  27. 4225
  28. 1681
  29. 5776
  30. 2209
  31. 1024
  32. 6084
  33. 8281
  34. 9409
  35. 961
  36. 8464
  37. 7569
  38. 8836
  39. 5329
  40. 9216

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