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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 829 · 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. 1.31² =
  2. 2.59² =
  3. 3.21² =
  4. 4.71² =
  5. 5.61² =
  6. 6.31² =
  7. 7.61² =
  8. 8.71² =
  9. 9.59² =
  10. 10.61² =
  11. 11.79² =
  12. 12.51² =
  13. 13.79² =
  14. 14.69² =
  15. 15.61² =
  16. 16.61² =
  17. 17.39² =
  18. 18.19² =
  19. 19.39² =
  20. 20.89² =
  21. 21.69² =
  22. 22.29² =
  23. 23.81² =
  24. 24.61² =
  25. 25.71² =
  26. 26.79² =
  27. 27.51² =
  28. 28.69² =
  29. 29.71² =
  30. 30.51² =
  31. 31.51² =
  32. 32.59² =
  33. 33.91² =
  34. 34.19² =
  35. 35.31² =
  36. 36.91² =
  37. 37.29² =
  38. 38.21² =
  39. 39.81² =
  40. 40.91² =

Answer key

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

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