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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 942 · 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. 1.39² =
  2. 2.89² =
  3. 3.69² =
  4. 4.39² =
  5. 5.19² =
  6. 6.81² =
  7. 7.49² =
  8. 8.71² =
  9. 9.79² =
  10. 10.49² =
  11. 11.41² =
  12. 12.59² =
  13. 13.69² =
  14. 14.59² =
  15. 15.91² =
  16. 16.79² =
  17. 17.39² =
  18. 18.71² =
  19. 19.79² =
  20. 20.29² =
  21. 21.69² =
  22. 22.19² =
  23. 23.69² =
  24. 24.21² =
  25. 25.59² =
  26. 26.19² =
  27. 27.89² =
  28. 28.61² =
  29. 29.21² =
  30. 30.71² =
  31. 31.19² =
  32. 32.79² =
  33. 33.59² =
  34. 34.59² =
  35. 35.51² =
  36. 36.71² =
  37. 37.31² =
  38. 38.29² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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