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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 588 · 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. 1.41² =
  2. 2.89² =
  3. 3.39² =
  4. 4.29² =
  5. 5.29² =
  6. 6.29² =
  7. 7.51² =
  8. 8.69² =
  9. 9.89² =
  10. 10.29² =
  11. 11.49² =
  12. 12.91² =
  13. 13.29² =
  14. 14.41² =
  15. 15.51² =
  16. 16.19² =
  17. 17.19² =
  18. 18.19² =
  19. 19.29² =
  20. 20.41² =
  21. 21.31² =
  22. 22.31² =
  23. 23.19² =
  24. 24.41² =
  25. 25.49² =
  26. 26.39² =
  27. 27.21² =
  28. 28.69² =
  29. 29.61² =
  30. 30.79² =
  31. 31.69² =
  32. 32.79² =
  33. 33.81² =
  34. 34.69² =
  35. 35.39² =
  36. 36.61² =
  37. 37.29² =
  38. 38.31² =
  39. 39.19² =
  40. 40.79² =

Answer key

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

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