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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 455 · 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. 1.61² =
  2. 2.71² =
  3. 3.29² =
  4. 4.71² =
  5. 5.89² =
  6. 6.69² =
  7. 7.19² =
  8. 8.71² =
  9. 9.89² =
  10. 10.49² =
  11. 11.89² =
  12. 12.21² =
  13. 13.39² =
  14. 14.51² =
  15. 15.49² =
  16. 16.31² =
  17. 17.29² =
  18. 18.39² =
  19. 19.21² =
  20. 20.69² =
  21. 21.69² =
  22. 22.41² =
  23. 23.69² =
  24. 24.69² =
  25. 25.71² =
  26. 26.21² =
  27. 27.79² =
  28. 28.29² =
  29. 29.21² =
  30. 30.89² =
  31. 31.71² =
  32. 32.39² =
  33. 33.19² =
  34. 34.29² =
  35. 35.49² =
  36. 36.19² =
  37. 37.31² =
  38. 38.31² =
  39. 39.49² =
  40. 40.69² =

Answer key

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

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