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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 352 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.31² =
  2. 2.29² =
  3. 3.91² =
  4. 4.29² =
  5. 5.49² =
  6. 6.41² =
  7. 7.61² =
  8. 8.19² =
  9. 9.59² =
  10. 10.49² =
  11. 11.71² =
  12. 12.61² =
  13. 13.91² =
  14. 14.19² =
  15. 15.21² =
  16. 16.19² =
  17. 17.59² =
  18. 18.51² =
  19. 19.49² =
  20. 20.49² =
  21. 21.89² =
  22. 22.21² =
  23. 23.41² =
  24. 24.41² =
  25. 25.79² =
  26. 26.71² =
  27. 27.41² =
  28. 28.51² =
  29. 29.29² =
  30. 30.29² =
  31. 31.21² =
  32. 32.91² =
  33. 33.59² =
  34. 34.89² =
  35. 35.79² =
  36. 36.51² =
  37. 37.51² =
  38. 38.49² =
  39. 39.41² =
  40. 40.19² =

Answer key

  1. 961
  2. 841
  3. 8281
  4. 841
  5. 2401
  6. 1681
  7. 3721
  8. 361
  9. 3481
  10. 2401
  11. 5041
  12. 3721
  13. 8281
  14. 361
  15. 441
  16. 361
  17. 3481
  18. 2601
  19. 2401
  20. 2401
  21. 7921
  22. 441
  23. 1681
  24. 1681
  25. 6241
  26. 5041
  27. 1681
  28. 2601
  29. 841
  30. 841
  31. 441
  32. 8281
  33. 3481
  34. 7921
  35. 6241
  36. 2601
  37. 2601
  38. 2401
  39. 1681
  40. 361

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