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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 507 · 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. 1.74² =
  2. 2.64² =
  3. 3.46² =
  4. 4.94² =
  5. 5.88² =
  6. 6.87² =
  7. 7.84² =
  8. 8.59² =
  9. 9.99² =
  10. 10.47² =
  11. 11.91² =
  12. 12.96² =
  13. 13.83² =
  14. 14.62² =
  15. 15.49² =
  16. 16.63² =
  17. 17.51² =
  18. 18.71² =
  19. 19.86² =
  20. 20.93² =
  21. 21.65² =
  22. 22.56² =
  23. 23.43² =
  24. 24.45² =
  25. 25.72² =
  26. 26.81² =
  27. 27.31² =
  28. 28.37² =
  29. 29.54² =
  30. 30.61² =
  31. 31.39² =
  32. 32.34² =
  33. 33.73² =
  34. 34.95² =
  35. 35.41² =
  36. 36.57² =
  37. 37.98² =
  38. 38.97² =
  39. 39.78² =
  40. 40.67² =

Answer key

  1. 5476
  2. 4096
  3. 2116
  4. 8836
  5. 7744
  6. 7569
  7. 7056
  8. 3481
  9. 9801
  10. 2209
  11. 8281
  12. 9216
  13. 6889
  14. 3844
  15. 2401
  16. 3969
  17. 2601
  18. 5041
  19. 7396
  20. 8649
  21. 4225
  22. 3136
  23. 1849
  24. 2025
  25. 5184
  26. 6561
  27. 961
  28. 1369
  29. 2916
  30. 3721
  31. 1521
  32. 1156
  33. 5329
  34. 9025
  35. 1681
  36. 3249
  37. 9604
  38. 9409
  39. 6084
  40. 4489

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