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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 19 · 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. 2.79² =
  3. 3.21² =
  4. 4.39² =
  5. 5.21² =
  6. 6.31² =
  7. 7.19² =
  8. 8.29² =
  9. 9.51² =
  10. 10.31² =
  11. 11.21² =
  12. 12.61² =
  13. 13.19² =
  14. 14.31² =
  15. 15.19² =
  16. 16.71² =
  17. 17.29² =
  18. 18.39² =
  19. 19.39² =
  20. 20.69² =
  21. 21.31² =
  22. 22.81² =
  23. 23.21² =
  24. 24.19² =
  25. 25.51² =
  26. 26.89² =
  27. 27.29² =
  28. 28.71² =
  29. 29.49² =
  30. 30.49² =
  31. 31.69² =
  32. 32.81² =
  33. 33.61² =
  34. 34.41² =
  35. 35.21² =
  36. 36.19² =
  37. 37.39² =
  38. 38.21² =
  39. 39.59² =
  40. 40.29² =

Answer key

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

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