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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 339 · 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. 1.81² =
  2. 2.69² =
  3. 3.29² =
  4. 4.69² =
  5. 5.29² =
  6. 6.81² =
  7. 7.59² =
  8. 8.89² =
  9. 9.79² =
  10. 10.89² =
  11. 11.91² =
  12. 12.51² =
  13. 13.81² =
  14. 14.71² =
  15. 15.91² =
  16. 16.91² =
  17. 17.71² =
  18. 18.19² =
  19. 19.39² =
  20. 20.71² =
  21. 21.49² =
  22. 22.31² =
  23. 23.61² =
  24. 24.59² =
  25. 25.69² =
  26. 26.61² =
  27. 27.91² =
  28. 28.21² =
  29. 29.19² =
  30. 30.71² =
  31. 31.69² =
  32. 32.19² =
  33. 33.89² =
  34. 34.81² =
  35. 35.69² =
  36. 36.29² =
  37. 37.51² =
  38. 38.29² =
  39. 39.81² =
  40. 40.41² =

Answer key

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

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