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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 514 · 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. 2.39² =
  3. 3.21² =
  4. 4.61² =
  5. 5.19² =
  6. 6.81² =
  7. 7.89² =
  8. 8.69² =
  9. 9.51² =
  10. 10.61² =
  11. 11.79² =
  12. 12.81² =
  13. 13.41² =
  14. 14.89² =
  15. 15.61² =
  16. 16.91² =
  17. 17.29² =
  18. 18.89² =
  19. 19.39² =
  20. 20.81² =
  21. 21.39² =
  22. 22.21² =
  23. 23.69² =
  24. 24.89² =
  25. 25.71² =
  26. 26.29² =
  27. 27.21² =
  28. 28.39² =
  29. 29.19² =
  30. 30.91² =
  31. 31.51² =
  32. 32.61² =
  33. 33.29² =
  34. 34.21² =
  35. 35.89² =
  36. 36.31² =
  37. 37.91² =
  38. 38.29² =
  39. 39.81² =
  40. 40.29² =

Answer key

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

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