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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 99 · 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. 1.71² =
  2. 2.68² =
  3. 3.76² =
  4. 4.51² =
  5. 5.63² =
  6. 6.85² =
  7. 7.73² =
  8. 8.34² =
  9. 9.67² =
  10. 10.59² =
  11. 11.72² =
  12. 12.47² =
  13. 13.35² =
  14. 14.81² =
  15. 15.61² =
  16. 16.55² =
  17. 17.82² =
  18. 18.69² =
  19. 19.56² =
  20. 20.41² =
  21. 21.86² =
  22. 22.54² =
  23. 23.88² =
  24. 24.48² =
  25. 25.53² =
  26. 26.96² =
  27. 27.44² =
  28. 28.92² =
  29. 29.99² =
  30. 30.95² =
  31. 31.65² =
  32. 32.91² =
  33. 33.45² =
  34. 34.57² =
  35. 35.94² =
  36. 36.89² =
  37. 37.49² =
  38. 38.66² =
  39. 39.31² =
  40. 40.93² =

Answer key

  1. 5041
  2. 4624
  3. 5776
  4. 2601
  5. 3969
  6. 7225
  7. 5329
  8. 1156
  9. 4489
  10. 3481
  11. 5184
  12. 2209
  13. 1225
  14. 6561
  15. 3721
  16. 3025
  17. 6724
  18. 4761
  19. 3136
  20. 1681
  21. 7396
  22. 2916
  23. 7744
  24. 2304
  25. 2809
  26. 9216
  27. 1936
  28. 8464
  29. 9801
  30. 9025
  31. 4225
  32. 8281
  33. 2025
  34. 3249
  35. 8836
  36. 7921
  37. 2401
  38. 4356
  39. 961
  40. 8649

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