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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 384 · 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. 2.69² =
  3. 3.69² =
  4. 4.71² =
  5. 5.71² =
  6. 6.51² =
  7. 7.69² =
  8. 8.69² =
  9. 9.29² =
  10. 10.71² =
  11. 11.61² =
  12. 12.19² =
  13. 13.41² =
  14. 14.31² =
  15. 15.31² =
  16. 16.29² =
  17. 17.79² =
  18. 18.31² =
  19. 19.39² =
  20. 20.79² =
  21. 21.19² =
  22. 22.71² =
  23. 23.29² =
  24. 24.89² =
  25. 25.19² =
  26. 26.21² =
  27. 27.59² =
  28. 28.49² =
  29. 29.31² =
  30. 30.21² =
  31. 31.39² =
  32. 32.31² =
  33. 33.29² =
  34. 34.39² =
  35. 35.39² =
  36. 36.41² =
  37. 37.21² =
  38. 38.39² =
  39. 39.81² =
  40. 40.91² =

Answer key

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

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