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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 53 · 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. 2.29² =
  3. 3.29² =
  4. 4.71² =
  5. 5.39² =
  6. 6.29² =
  7. 7.69² =
  8. 8.59² =
  9. 9.29² =
  10. 10.29² =
  11. 11.29² =
  12. 12.61² =
  13. 13.81² =
  14. 14.69² =
  15. 15.49² =
  16. 16.61² =
  17. 17.31² =
  18. 18.81² =
  19. 19.89² =
  20. 20.39² =
  21. 21.59² =
  22. 22.81² =
  23. 23.59² =
  24. 24.91² =
  25. 25.89² =
  26. 26.51² =
  27. 27.91² =
  28. 28.51² =
  29. 29.69² =
  30. 30.39² =
  31. 31.29² =
  32. 32.29² =
  33. 33.39² =
  34. 34.39² =
  35. 35.59² =
  36. 36.61² =
  37. 37.81² =
  38. 38.69² =
  39. 39.89² =
  40. 40.59² =

Answer key

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

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