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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 648 · 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. 1.71² =
  2. 2.21² =
  3. 3.29² =
  4. 4.29² =
  5. 5.31² =
  6. 6.39² =
  7. 7.81² =
  8. 8.79² =
  9. 9.19² =
  10. 10.79² =
  11. 11.49² =
  12. 12.31² =
  13. 13.69² =
  14. 14.21² =
  15. 15.71² =
  16. 16.39² =
  17. 17.69² =
  18. 18.41² =
  19. 19.19² =
  20. 20.89² =
  21. 21.81² =
  22. 22.69² =
  23. 23.81² =
  24. 24.89² =
  25. 25.19² =
  26. 26.69² =
  27. 27.81² =
  28. 28.19² =
  29. 29.41² =
  30. 30.39² =
  31. 31.49² =
  32. 32.51² =
  33. 33.39² =
  34. 34.79² =
  35. 35.29² =
  36. 36.79² =
  37. 37.71² =
  38. 38.29² =
  39. 39.39² =
  40. 40.31² =

Answer key

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

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