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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 397 · 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. 1.89² =
  2. 2.69² =
  3. 3.81² =
  4. 4.21² =
  5. 5.59² =
  6. 6.39² =
  7. 7.91² =
  8. 8.61² =
  9. 9.89² =
  10. 10.19² =
  11. 11.19² =
  12. 12.29² =
  13. 13.69² =
  14. 14.31² =
  15. 15.59² =
  16. 16.21² =
  17. 17.49² =
  18. 18.29² =
  19. 19.89² =
  20. 20.59² =
  21. 21.59² =
  22. 22.71² =
  23. 23.69² =
  24. 24.81² =
  25. 25.51² =
  26. 26.69² =
  27. 27.61² =
  28. 28.21² =
  29. 29.41² =
  30. 30.89² =
  31. 31.51² =
  32. 32.29² =
  33. 33.39² =
  34. 34.51² =
  35. 35.39² =
  36. 36.41² =
  37. 37.31² =
  38. 38.19² =
  39. 39.19² =
  40. 40.19² =

Answer key

  1. 7921
  2. 4761
  3. 6561
  4. 441
  5. 3481
  6. 1521
  7. 8281
  8. 3721
  9. 7921
  10. 361
  11. 361
  12. 841
  13. 4761
  14. 961
  15. 3481
  16. 441
  17. 2401
  18. 841
  19. 7921
  20. 3481
  21. 3481
  22. 5041
  23. 4761
  24. 6561
  25. 2601
  26. 4761
  27. 3721
  28. 441
  29. 1681
  30. 7921
  31. 2601
  32. 841
  33. 1521
  34. 2601
  35. 1521
  36. 1681
  37. 961
  38. 361
  39. 361
  40. 361

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