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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 999 · 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. 1.19² =
  2. 2.91² =
  3. 3.39² =
  4. 4.19² =
  5. 5.81² =
  6. 6.71² =
  7. 7.69² =
  8. 8.69² =
  9. 9.79² =
  10. 10.79² =
  11. 11.69² =
  12. 12.81² =
  13. 13.59² =
  14. 14.79² =
  15. 15.71² =
  16. 16.51² =
  17. 17.89² =
  18. 18.89² =
  19. 19.91² =
  20. 20.61² =
  21. 21.81² =
  22. 22.19² =
  23. 23.71² =
  24. 24.91² =
  25. 25.79² =
  26. 26.21² =
  27. 27.49² =
  28. 28.41² =
  29. 29.41² =
  30. 30.29² =
  31. 31.61² =
  32. 32.91² =
  33. 33.29² =
  34. 34.41² =
  35. 35.51² =
  36. 36.49² =
  37. 37.79² =
  38. 38.49² =
  39. 39.21² =
  40. 40.89² =

Answer key

  1. 361
  2. 8281
  3. 1521
  4. 361
  5. 6561
  6. 5041
  7. 4761
  8. 4761
  9. 6241
  10. 6241
  11. 4761
  12. 6561
  13. 3481
  14. 6241
  15. 5041
  16. 2601
  17. 7921
  18. 7921
  19. 8281
  20. 3721
  21. 6561
  22. 361
  23. 5041
  24. 8281
  25. 6241
  26. 441
  27. 2401
  28. 1681
  29. 1681
  30. 841
  31. 3721
  32. 8281
  33. 841
  34. 1681
  35. 2601
  36. 2401
  37. 6241
  38. 2401
  39. 441
  40. 7921

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