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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 29 · 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. 2.69² =
  3. 3.69² =
  4. 4.39² =
  5. 5.39² =
  6. 6.29² =
  7. 7.41² =
  8. 8.79² =
  9. 9.19² =
  10. 10.79² =
  11. 11.49² =
  12. 12.89² =
  13. 13.81² =
  14. 14.29² =
  15. 15.19² =
  16. 16.19² =
  17. 17.69² =
  18. 18.19² =
  19. 19.89² =
  20. 20.79² =
  21. 21.29² =
  22. 22.51² =
  23. 23.31² =
  24. 24.19² =
  25. 25.89² =
  26. 26.39² =
  27. 27.21² =
  28. 28.19² =
  29. 29.69² =
  30. 30.29² =
  31. 31.69² =
  32. 32.19² =
  33. 33.41² =
  34. 34.41² =
  35. 35.59² =
  36. 36.41² =
  37. 37.79² =
  38. 38.39² =
  39. 39.81² =
  40. 40.59² =

Answer key

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

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