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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 771 · 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. 1.59² =
  2. 2.39² =
  3. 3.21² =
  4. 4.51² =
  5. 5.89² =
  6. 6.61² =
  7. 7.51² =
  8. 8.59² =
  9. 9.21² =
  10. 10.61² =
  11. 11.19² =
  12. 12.31² =
  13. 13.91² =
  14. 14.79² =
  15. 15.71² =
  16. 16.51² =
  17. 17.29² =
  18. 18.39² =
  19. 19.71² =
  20. 20.31² =
  21. 21.29² =
  22. 22.59² =
  23. 23.39² =
  24. 24.71² =
  25. 25.61² =
  26. 26.49² =
  27. 27.31² =
  28. 28.59² =
  29. 29.49² =
  30. 30.31² =
  31. 31.39² =
  32. 32.71² =
  33. 33.81² =
  34. 34.19² =
  35. 35.91² =
  36. 36.31² =
  37. 37.31² =
  38. 38.89² =
  39. 39.29² =
  40. 40.19² =

Answer key

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

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