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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 27 · 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. 1.29² =
  2. 2.81² =
  3. 3.51² =
  4. 4.31² =
  5. 5.71² =
  6. 6.29² =
  7. 7.21² =
  8. 8.21² =
  9. 9.71² =
  10. 10.79² =
  11. 11.39² =
  12. 12.91² =
  13. 13.91² =
  14. 14.29² =
  15. 15.21² =
  16. 16.79² =
  17. 17.69² =
  18. 18.71² =
  19. 19.61² =
  20. 20.91² =
  21. 21.51² =
  22. 22.51² =
  23. 23.81² =
  24. 24.21² =
  25. 25.51² =
  26. 26.21² =
  27. 27.59² =
  28. 28.89² =
  29. 29.31² =
  30. 30.79² =
  31. 31.69² =
  32. 32.41² =
  33. 33.29² =
  34. 34.91² =
  35. 35.89² =
  36. 36.81² =
  37. 37.31² =
  38. 38.69² =
  39. 39.41² =
  40. 40.91² =

Answer key

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

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