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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 6 · 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. 2.59² =
  3. 3.96² =
  4. 4.32² =
  5. 5.92² =
  6. 6.79² =
  7. 7.82² =
  8. 8.44² =
  9. 9.43² =
  10. 10.83² =
  11. 11.88² =
  12. 12.71² =
  13. 13.51² =
  14. 14.49² =
  15. 15.91² =
  16. 16.89² =
  17. 17.37² =
  18. 18.68² =
  19. 19.48² =
  20. 20.81² =
  21. 21.87² =
  22. 22.98² =
  23. 23.95² =
  24. 24.75² =
  25. 25.77² =
  26. 26.99² =
  27. 27.67² =
  28. 28.63² =
  29. 29.62² =
  30. 30.54² =
  31. 31.65² =
  32. 32.45² =
  33. 33.73² =
  34. 34.97² =
  35. 35.36² =
  36. 36.74² =
  37. 37.39² =
  38. 38.66² =
  39. 39.31² =
  40. 40.61² =

Answer key

  1. 4096
  2. 3481
  3. 9216
  4. 1024
  5. 8464
  6. 6241
  7. 6724
  8. 1936
  9. 1849
  10. 6889
  11. 7744
  12. 5041
  13. 2601
  14. 2401
  15. 8281
  16. 7921
  17. 1369
  18. 4624
  19. 2304
  20. 6561
  21. 7569
  22. 9604
  23. 9025
  24. 5625
  25. 5929
  26. 9801
  27. 4489
  28. 3969
  29. 3844
  30. 2916
  31. 4225
  32. 2025
  33. 5329
  34. 9409
  35. 1296
  36. 5476
  37. 1521
  38. 4356
  39. 961
  40. 3721

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