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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 575 · 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. 1.71² =
  2. 2.31² =
  3. 3.19² =
  4. 4.39² =
  5. 5.39² =
  6. 6.79² =
  7. 7.91² =
  8. 8.49² =
  9. 9.89² =
  10. 10.51² =
  11. 11.19² =
  12. 12.39² =
  13. 13.61² =
  14. 14.21² =
  15. 15.31² =
  16. 16.61² =
  17. 17.21² =
  18. 18.19² =
  19. 19.29² =
  20. 20.31² =
  21. 21.39² =
  22. 22.49² =
  23. 23.91² =
  24. 24.19² =
  25. 25.91² =
  26. 26.21² =
  27. 27.71² =
  28. 28.31² =
  29. 29.89² =
  30. 30.21² =
  31. 31.19² =
  32. 32.61² =
  33. 33.31² =
  34. 34.79² =
  35. 35.91² =
  36. 36.29² =
  37. 37.39² =
  38. 38.91² =
  39. 39.49² =
  40. 40.41² =

Answer key

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

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