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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 809 · 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. 1.39² =
  2. 2.91² =
  3. 3.51² =
  4. 4.89² =
  5. 5.79² =
  6. 6.19² =
  7. 7.41² =
  8. 8.21² =
  9. 9.49² =
  10. 10.51² =
  11. 11.71² =
  12. 12.29² =
  13. 13.49² =
  14. 14.31² =
  15. 15.51² =
  16. 16.41² =
  17. 17.19² =
  18. 18.69² =
  19. 19.51² =
  20. 20.81² =
  21. 21.69² =
  22. 22.69² =
  23. 23.19² =
  24. 24.89² =
  25. 25.39² =
  26. 26.49² =
  27. 27.31² =
  28. 28.39² =
  29. 29.79² =
  30. 30.39² =
  31. 31.39² =
  32. 32.39² =
  33. 33.49² =
  34. 34.39² =
  35. 35.29² =
  36. 36.71² =
  37. 37.69² =
  38. 38.79² =
  39. 39.81² =
  40. 40.59² =

Answer key

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

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