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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 959 · 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. 1.69² =
  2. 2.31² =
  3. 3.39² =
  4. 4.79² =
  5. 5.41² =
  6. 6.79² =
  7. 7.69² =
  8. 8.89² =
  9. 9.61² =
  10. 10.49² =
  11. 11.41² =
  12. 12.69² =
  13. 13.81² =
  14. 14.71² =
  15. 15.89² =
  16. 16.19² =
  17. 17.89² =
  18. 18.91² =
  19. 19.21² =
  20. 20.91² =
  21. 21.71² =
  22. 22.81² =
  23. 23.21² =
  24. 24.81² =
  25. 25.71² =
  26. 26.51² =
  27. 27.51² =
  28. 28.79² =
  29. 29.59² =
  30. 30.19² =
  31. 31.79² =
  32. 32.79² =
  33. 33.89² =
  34. 34.81² =
  35. 35.89² =
  36. 36.61² =
  37. 37.61² =
  38. 38.21² =
  39. 39.49² =
  40. 40.79² =

Answer key

  1. 4761
  2. 961
  3. 1521
  4. 6241
  5. 1681
  6. 6241
  7. 4761
  8. 7921
  9. 3721
  10. 2401
  11. 1681
  12. 4761
  13. 6561
  14. 5041
  15. 7921
  16. 361
  17. 7921
  18. 8281
  19. 441
  20. 8281
  21. 5041
  22. 6561
  23. 441
  24. 6561
  25. 5041
  26. 2601
  27. 2601
  28. 6241
  29. 3481
  30. 361
  31. 6241
  32. 6241
  33. 7921
  34. 6561
  35. 7921
  36. 3721
  37. 3721
  38. 441
  39. 2401
  40. 6241

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