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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 806 · 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. 3.71² =
  4. 4.71² =
  5. 5.71² =
  6. 6.61² =
  7. 7.89² =
  8. 8.31² =
  9. 9.51² =
  10. 10.41² =
  11. 11.19² =
  12. 12.39² =
  13. 13.21² =
  14. 14.51² =
  15. 15.21² =
  16. 16.39² =
  17. 17.69² =
  18. 18.61² =
  19. 19.69² =
  20. 20.61² =
  21. 21.79² =
  22. 22.31² =
  23. 23.19² =
  24. 24.41² =
  25. 25.51² =
  26. 26.59² =
  27. 27.59² =
  28. 28.29² =
  29. 29.19² =
  30. 30.39² =
  31. 31.89² =
  32. 32.29² =
  33. 33.41² =
  34. 34.21² =
  35. 35.59² =
  36. 36.29² =
  37. 37.81² =
  38. 38.29² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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