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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 744 · 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. 2.21² =
  3. 3.59² =
  4. 4.59² =
  5. 5.49² =
  6. 6.31² =
  7. 7.91² =
  8. 8.89² =
  9. 9.89² =
  10. 10.29² =
  11. 11.61² =
  12. 12.91² =
  13. 13.39² =
  14. 14.69² =
  15. 15.29² =
  16. 16.19² =
  17. 17.89² =
  18. 18.29² =
  19. 19.51² =
  20. 20.89² =
  21. 21.41² =
  22. 22.59² =
  23. 23.89² =
  24. 24.21² =
  25. 25.69² =
  26. 26.29² =
  27. 27.69² =
  28. 28.69² =
  29. 29.51² =
  30. 30.39² =
  31. 31.19² =
  32. 32.29² =
  33. 33.49² =
  34. 34.19² =
  35. 35.19² =
  36. 36.21² =
  37. 37.91² =
  38. 38.39² =
  39. 39.71² =
  40. 40.19² =

Answer key

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

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