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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 341 · 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. 1.81² =
  2. 2.29² =
  3. 3.29² =
  4. 4.39² =
  5. 5.49² =
  6. 6.31² =
  7. 7.69² =
  8. 8.39² =
  9. 9.51² =
  10. 10.21² =
  11. 11.61² =
  12. 12.31² =
  13. 13.89² =
  14. 14.91² =
  15. 15.29² =
  16. 16.29² =
  17. 17.41² =
  18. 18.19² =
  19. 19.89² =
  20. 20.69² =
  21. 21.91² =
  22. 22.21² =
  23. 23.29² =
  24. 24.49² =
  25. 25.29² =
  26. 26.91² =
  27. 27.79² =
  28. 28.81² =
  29. 29.51² =
  30. 30.51² =
  31. 31.91² =
  32. 32.71² =
  33. 33.21² =
  34. 34.91² =
  35. 35.89² =
  36. 36.89² =
  37. 37.81² =
  38. 38.29² =
  39. 39.31² =
  40. 40.89² =

Answer key

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

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