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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 287 · 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. 1.77² =
  2. 2.76² =
  3. 3.47² =
  4. 4.64² =
  5. 5.48² =
  6. 6.44² =
  7. 7.97² =
  8. 8.66² =
  9. 9.81² =
  10. 10.88² =
  11. 11.56² =
  12. 12.89² =
  13. 13.91² =
  14. 14.43² =
  15. 15.79² =
  16. 16.84² =
  17. 17.41² =
  18. 18.35² =
  19. 19.36² =
  20. 20.63² =
  21. 21.67² =
  22. 22.65² =
  23. 23.52² =
  24. 24.61² =
  25. 25.73² =
  26. 26.33² =
  27. 27.51² =
  28. 28.68² =
  29. 29.74² =
  30. 30.49² =
  31. 31.96² =
  32. 32.94² =
  33. 33.31² =
  34. 34.82² =
  35. 35.45² =
  36. 36.98² =
  37. 37.34² =
  38. 38.59² =
  39. 39.58² =
  40. 40.87² =

Answer key

  1. 5929
  2. 5776
  3. 2209
  4. 4096
  5. 2304
  6. 1936
  7. 9409
  8. 4356
  9. 6561
  10. 7744
  11. 3136
  12. 7921
  13. 8281
  14. 1849
  15. 6241
  16. 7056
  17. 1681
  18. 1225
  19. 1296
  20. 3969
  21. 4489
  22. 4225
  23. 2704
  24. 3721
  25. 5329
  26. 1089
  27. 2601
  28. 4624
  29. 5476
  30. 2401
  31. 9216
  32. 8836
  33. 961
  34. 6724
  35. 2025
  36. 9604
  37. 1156
  38. 3481
  39. 3364
  40. 7569

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