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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 569 · 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. 1.71² =
  2. 2.51² =
  3. 3.29² =
  4. 4.91² =
  5. 5.19² =
  6. 6.91² =
  7. 7.51² =
  8. 8.39² =
  9. 9.89² =
  10. 10.51² =
  11. 11.29² =
  12. 12.19² =
  13. 13.69² =
  14. 14.69² =
  15. 15.21² =
  16. 16.21² =
  17. 17.51² =
  18. 18.71² =
  19. 19.49² =
  20. 20.61² =
  21. 21.19² =
  22. 22.31² =
  23. 23.71² =
  24. 24.71² =
  25. 25.69² =
  26. 26.39² =
  27. 27.81² =
  28. 28.51² =
  29. 29.31² =
  30. 30.59² =
  31. 31.29² =
  32. 32.79² =
  33. 33.89² =
  34. 34.91² =
  35. 35.69² =
  36. 36.21² =
  37. 37.51² =
  38. 38.21² =
  39. 39.89² =
  40. 40.21² =

Answer key

  1. 5041
  2. 2601
  3. 841
  4. 8281
  5. 361
  6. 8281
  7. 2601
  8. 1521
  9. 7921
  10. 2601
  11. 841
  12. 361
  13. 4761
  14. 4761
  15. 441
  16. 441
  17. 2601
  18. 5041
  19. 2401
  20. 3721
  21. 361
  22. 961
  23. 5041
  24. 5041
  25. 4761
  26. 1521
  27. 6561
  28. 2601
  29. 961
  30. 3481
  31. 841
  32. 6241
  33. 7921
  34. 8281
  35. 4761
  36. 441
  37. 2601
  38. 441
  39. 7921
  40. 441

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