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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 843 · 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. 2.29² =
  3. 3.59² =
  4. 4.91² =
  5. 5.81² =
  6. 6.31² =
  7. 7.51² =
  8. 8.29² =
  9. 9.79² =
  10. 10.49² =
  11. 11.39² =
  12. 12.21² =
  13. 13.69² =
  14. 14.61² =
  15. 15.19² =
  16. 16.71² =
  17. 17.39² =
  18. 18.41² =
  19. 19.79² =
  20. 20.21² =
  21. 21.91² =
  22. 22.69² =
  23. 23.61² =
  24. 24.71² =
  25. 25.51² =
  26. 26.41² =
  27. 27.61² =
  28. 28.71² =
  29. 29.91² =
  30. 30.31² =
  31. 31.79² =
  32. 32.39² =
  33. 33.31² =
  34. 34.29² =
  35. 35.41² =
  36. 36.71² =
  37. 37.61² =
  38. 38.91² =
  39. 39.21² =
  40. 40.89² =

Answer key

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

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