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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 565 · 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. 1.19² =
  2. 2.51² =
  3. 3.31² =
  4. 4.41² =
  5. 5.81² =
  6. 6.79² =
  7. 7.69² =
  8. 8.91² =
  9. 9.21² =
  10. 10.29² =
  11. 11.71² =
  12. 12.21² =
  13. 13.21² =
  14. 14.69² =
  15. 15.29² =
  16. 16.69² =
  17. 17.21² =
  18. 18.39² =
  19. 19.59² =
  20. 20.41² =
  21. 21.31² =
  22. 22.69² =
  23. 23.59² =
  24. 24.89² =
  25. 25.39² =
  26. 26.29² =
  27. 27.71² =
  28. 28.39² =
  29. 29.31² =
  30. 30.91² =
  31. 31.91² =
  32. 32.91² =
  33. 33.39² =
  34. 34.29² =
  35. 35.19² =
  36. 36.61² =
  37. 37.21² =
  38. 38.69² =
  39. 39.29² =
  40. 40.41² =

Answer key

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

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