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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 705 · 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. 2.29² =
  3. 3.29² =
  4. 4.29² =
  5. 5.21² =
  6. 6.31² =
  7. 7.51² =
  8. 8.51² =
  9. 9.69² =
  10. 10.81² =
  11. 11.59² =
  12. 12.51² =
  13. 13.19² =
  14. 14.79² =
  15. 15.39² =
  16. 16.21² =
  17. 17.41² =
  18. 18.49² =
  19. 19.51² =
  20. 20.81² =
  21. 21.21² =
  22. 22.69² =
  23. 23.51² =
  24. 24.91² =
  25. 25.31² =
  26. 26.71² =
  27. 27.39² =
  28. 28.81² =
  29. 29.29² =
  30. 30.69² =
  31. 31.91² =
  32. 32.61² =
  33. 33.61² =
  34. 34.79² =
  35. 35.29² =
  36. 36.41² =
  37. 37.81² =
  38. 38.89² =
  39. 39.29² =
  40. 40.91² =

Answer key

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

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