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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 760 · 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. 2.59² =
  3. 3.31² =
  4. 4.71² =
  5. 5.29² =
  6. 6.41² =
  7. 7.59² =
  8. 8.69² =
  9. 9.31² =
  10. 10.71² =
  11. 11.89² =
  12. 12.49² =
  13. 13.49² =
  14. 14.29² =
  15. 15.69² =
  16. 16.51² =
  17. 17.79² =
  18. 18.21² =
  19. 19.29² =
  20. 20.29² =
  21. 21.41² =
  22. 22.39² =
  23. 23.19² =
  24. 24.39² =
  25. 25.19² =
  26. 26.29² =
  27. 27.79² =
  28. 28.59² =
  29. 29.51² =
  30. 30.81² =
  31. 31.89² =
  32. 32.49² =
  33. 33.39² =
  34. 34.91² =
  35. 35.39² =
  36. 36.71² =
  37. 37.29² =
  38. 38.51² =
  39. 39.89² =
  40. 40.89² =

Answer key

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

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