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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 59 · 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. 1.29² =
  2. 2.49² =
  3. 3.69² =
  4. 4.81² =
  5. 5.39² =
  6. 6.91² =
  7. 7.31² =
  8. 8.61² =
  9. 9.89² =
  10. 10.81² =
  11. 11.41² =
  12. 12.29² =
  13. 13.81² =
  14. 14.51² =
  15. 15.29² =
  16. 16.41² =
  17. 17.59² =
  18. 18.51² =
  19. 19.29² =
  20. 20.41² =
  21. 21.89² =
  22. 22.51² =
  23. 23.41² =
  24. 24.41² =
  25. 25.19² =
  26. 26.19² =
  27. 27.71² =
  28. 28.39² =
  29. 29.51² =
  30. 30.49² =
  31. 31.31² =
  32. 32.19² =
  33. 33.59² =
  34. 34.41² =
  35. 35.39² =
  36. 36.59² =
  37. 37.21² =
  38. 38.49² =
  39. 39.61² =
  40. 40.51² =

Answer key

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

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