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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 566 · 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. 2.19² =
  3. 3.19² =
  4. 4.39² =
  5. 5.61² =
  6. 6.81² =
  7. 7.29² =
  8. 8.19² =
  9. 9.89² =
  10. 10.51² =
  11. 11.19² =
  12. 12.79² =
  13. 13.49² =
  14. 14.61² =
  15. 15.71² =
  16. 16.51² =
  17. 17.91² =
  18. 18.19² =
  19. 19.19² =
  20. 20.69² =
  21. 21.19² =
  22. 22.31² =
  23. 23.59² =
  24. 24.41² =
  25. 25.39² =
  26. 26.21² =
  27. 27.39² =
  28. 28.71² =
  29. 29.69² =
  30. 30.29² =
  31. 31.19² =
  32. 32.69² =
  33. 33.59² =
  34. 34.29² =
  35. 35.71² =
  36. 36.51² =
  37. 37.51² =
  38. 38.41² =
  39. 39.41² =
  40. 40.39² =

Answer key

  1. 361
  2. 361
  3. 361
  4. 1521
  5. 3721
  6. 6561
  7. 841
  8. 361
  9. 7921
  10. 2601
  11. 361
  12. 6241
  13. 2401
  14. 3721
  15. 5041
  16. 2601
  17. 8281
  18. 361
  19. 361
  20. 4761
  21. 361
  22. 961
  23. 3481
  24. 1681
  25. 1521
  26. 441
  27. 1521
  28. 5041
  29. 4761
  30. 841
  31. 361
  32. 4761
  33. 3481
  34. 841
  35. 5041
  36. 2601
  37. 2601
  38. 1681
  39. 1681
  40. 1521

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