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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 469 · 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. 2.81² =
  3. 3.39² =
  4. 4.51² =
  5. 5.41² =
  6. 6.61² =
  7. 7.49² =
  8. 8.69² =
  9. 9.39² =
  10. 10.19² =
  11. 11.29² =
  12. 12.69² =
  13. 13.89² =
  14. 14.89² =
  15. 15.51² =
  16. 16.29² =
  17. 17.29² =
  18. 18.61² =
  19. 19.39² =
  20. 20.41² =
  21. 21.71² =
  22. 22.39² =
  23. 23.89² =
  24. 24.41² =
  25. 25.79² =
  26. 26.21² =
  27. 27.41² =
  28. 28.81² =
  29. 29.51² =
  30. 30.39² =
  31. 31.21² =
  32. 32.31² =
  33. 33.29² =
  34. 34.59² =
  35. 35.71² =
  36. 36.69² =
  37. 37.51² =
  38. 38.31² =
  39. 39.19² =
  40. 40.39² =

Answer key

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

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