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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 928 · 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. 1.59² =
  2. 2.89² =
  3. 3.71² =
  4. 4.81² =
  5. 5.49² =
  6. 6.59² =
  7. 7.31² =
  8. 8.21² =
  9. 9.39² =
  10. 10.41² =
  11. 11.81² =
  12. 12.49² =
  13. 13.71² =
  14. 14.49² =
  15. 15.29² =
  16. 16.71² =
  17. 17.59² =
  18. 18.71² =
  19. 19.61² =
  20. 20.91² =
  21. 21.79² =
  22. 22.19² =
  23. 23.81² =
  24. 24.81² =
  25. 25.91² =
  26. 26.91² =
  27. 27.51² =
  28. 28.51² =
  29. 29.59² =
  30. 30.79² =
  31. 31.61² =
  32. 32.89² =
  33. 33.61² =
  34. 34.71² =
  35. 35.69² =
  36. 36.49² =
  37. 37.49² =
  38. 38.31² =
  39. 39.19² =
  40. 40.71² =

Answer key

  1. 3481
  2. 7921
  3. 5041
  4. 6561
  5. 2401
  6. 3481
  7. 961
  8. 441
  9. 1521
  10. 1681
  11. 6561
  12. 2401
  13. 5041
  14. 2401
  15. 841
  16. 5041
  17. 3481
  18. 5041
  19. 3721
  20. 8281
  21. 6241
  22. 361
  23. 6561
  24. 6561
  25. 8281
  26. 8281
  27. 2601
  28. 2601
  29. 3481
  30. 6241
  31. 3721
  32. 7921
  33. 3721
  34. 5041
  35. 4761
  36. 2401
  37. 2401
  38. 961
  39. 361
  40. 5041

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