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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 54 · 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. 2.81² =
  3. 3.21² =
  4. 4.71² =
  5. 5.29² =
  6. 6.69² =
  7. 7.81² =
  8. 8.89² =
  9. 9.49² =
  10. 10.29² =
  11. 11.81² =
  12. 12.31² =
  13. 13.39² =
  14. 14.41² =
  15. 15.81² =
  16. 16.29² =
  17. 17.51² =
  18. 18.39² =
  19. 19.29² =
  20. 20.21² =
  21. 21.61² =
  22. 22.71² =
  23. 23.31² =
  24. 24.71² =
  25. 25.49² =
  26. 26.31² =
  27. 27.69² =
  28. 28.31² =
  29. 29.69² =
  30. 30.81² =
  31. 31.89² =
  32. 32.39² =
  33. 33.91² =
  34. 34.49² =
  35. 35.41² =
  36. 36.31² =
  37. 37.79² =
  38. 38.39² =
  39. 39.69² =
  40. 40.91² =

Answer key

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

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