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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 887 · 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. 1.29² =
  2. 2.89² =
  3. 3.51² =
  4. 4.31² =
  5. 5.39² =
  6. 6.51² =
  7. 7.51² =
  8. 8.91² =
  9. 9.71² =
  10. 10.79² =
  11. 11.81² =
  12. 12.29² =
  13. 13.59² =
  14. 14.29² =
  15. 15.21² =
  16. 16.19² =
  17. 17.21² =
  18. 18.59² =
  19. 19.19² =
  20. 20.71² =
  21. 21.79² =
  22. 22.59² =
  23. 23.49² =
  24. 24.81² =
  25. 25.79² =
  26. 26.49² =
  27. 27.79² =
  28. 28.59² =
  29. 29.59² =
  30. 30.39² =
  31. 31.69² =
  32. 32.89² =
  33. 33.49² =
  34. 34.29² =
  35. 35.61² =
  36. 36.49² =
  37. 37.31² =
  38. 38.89² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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