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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 777 · 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. 1.65² =
  2. 2.55² =
  3. 3.43² =
  4. 4.61² =
  5. 5.96² =
  6. 6.42² =
  7. 7.81² =
  8. 8.62² =
  9. 9.57² =
  10. 10.83² =
  11. 11.92² =
  12. 12.46² =
  13. 13.53² =
  14. 14.41² =
  15. 15.69² =
  16. 16.84² =
  17. 17.73² =
  18. 18.64² =
  19. 19.31² =
  20. 20.35² =
  21. 21.56² =
  22. 22.59² =
  23. 23.89² =
  24. 24.86² =
  25. 25.97² =
  26. 26.49² =
  27. 27.71² =
  28. 28.51² =
  29. 29.93² =
  30. 30.66² =
  31. 31.48² =
  32. 32.95² =
  33. 33.68² =
  34. 34.45² =
  35. 35.98² =
  36. 36.82² =
  37. 37.94² =
  38. 38.33² =
  39. 39.74² =
  40. 40.91² =

Answer key

  1. 4225
  2. 3025
  3. 1849
  4. 3721
  5. 9216
  6. 1764
  7. 6561
  8. 3844
  9. 3249
  10. 6889
  11. 8464
  12. 2116
  13. 2809
  14. 1681
  15. 4761
  16. 7056
  17. 5329
  18. 4096
  19. 961
  20. 1225
  21. 3136
  22. 3481
  23. 7921
  24. 7396
  25. 9409
  26. 2401
  27. 5041
  28. 2601
  29. 8649
  30. 4356
  31. 2304
  32. 9025
  33. 4624
  34. 2025
  35. 9604
  36. 6724
  37. 8836
  38. 1089
  39. 5476
  40. 8281

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