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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 477 · 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. 2.81² =
  3. 3.59² =
  4. 4.89² =
  5. 5.51² =
  6. 6.39² =
  7. 7.79² =
  8. 8.59² =
  9. 9.31² =
  10. 10.21² =
  11. 11.89² =
  12. 12.71² =
  13. 13.61² =
  14. 14.91² =
  15. 15.51² =
  16. 16.29² =
  17. 17.21² =
  18. 18.21² =
  19. 19.41² =
  20. 20.31² =
  21. 21.29² =
  22. 22.49² =
  23. 23.89² =
  24. 24.91² =
  25. 25.69² =
  26. 26.79² =
  27. 27.91² =
  28. 28.19² =
  29. 29.21² =
  30. 30.49² =
  31. 31.39² =
  32. 32.59² =
  33. 33.79² =
  34. 34.39² =
  35. 35.81² =
  36. 36.51² =
  37. 37.49² =
  38. 38.21² =
  39. 39.89² =
  40. 40.89² =

Answer key

  1. 841
  2. 6561
  3. 3481
  4. 7921
  5. 2601
  6. 1521
  7. 6241
  8. 3481
  9. 961
  10. 441
  11. 7921
  12. 5041
  13. 3721
  14. 8281
  15. 2601
  16. 841
  17. 441
  18. 441
  19. 1681
  20. 961
  21. 841
  22. 2401
  23. 7921
  24. 8281
  25. 4761
  26. 6241
  27. 8281
  28. 361
  29. 441
  30. 2401
  31. 1521
  32. 3481
  33. 6241
  34. 1521
  35. 6561
  36. 2601
  37. 2401
  38. 441
  39. 7921
  40. 7921

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