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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 386 · 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. 1.41² =
  2. 2.21² =
  3. 3.59² =
  4. 4.19² =
  5. 5.19² =
  6. 6.21² =
  7. 7.59² =
  8. 8.69² =
  9. 9.31² =
  10. 10.39² =
  11. 11.31² =
  12. 12.91² =
  13. 13.51² =
  14. 14.61² =
  15. 15.19² =
  16. 16.21² =
  17. 17.29² =
  18. 18.41² =
  19. 19.71² =
  20. 20.81² =
  21. 21.61² =
  22. 22.19² =
  23. 23.61² =
  24. 24.89² =
  25. 25.91² =
  26. 26.31² =
  27. 27.61² =
  28. 28.29² =
  29. 29.79² =
  30. 30.89² =
  31. 31.71² =
  32. 32.61² =
  33. 33.21² =
  34. 34.39² =
  35. 35.39² =
  36. 36.39² =
  37. 37.61² =
  38. 38.41² =
  39. 39.41² =
  40. 40.39² =

Answer key

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

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