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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 395 · 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. 2.79² =
  3. 3.29² =
  4. 4.39² =
  5. 5.19² =
  6. 6.31² =
  7. 7.61² =
  8. 8.31² =
  9. 9.59² =
  10. 10.51² =
  11. 11.89² =
  12. 12.31² =
  13. 13.51² =
  14. 14.59² =
  15. 15.41² =
  16. 16.39² =
  17. 17.19² =
  18. 18.49² =
  19. 19.29² =
  20. 20.81² =
  21. 21.31² =
  22. 22.71² =
  23. 23.21² =
  24. 24.41² =
  25. 25.61² =
  26. 26.39² =
  27. 27.19² =
  28. 28.39² =
  29. 29.81² =
  30. 30.91² =
  31. 31.41² =
  32. 32.91² =
  33. 33.41² =
  34. 34.69² =
  35. 35.59² =
  36. 36.51² =
  37. 37.89² =
  38. 38.81² =
  39. 39.91² =
  40. 40.41² =

Answer key

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

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