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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 658 · 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. 1.41² =
  2. 2.31² =
  3. 3.79² =
  4. 4.31² =
  5. 5.41² =
  6. 6.91² =
  7. 7.71² =
  8. 8.51² =
  9. 9.91² =
  10. 10.61² =
  11. 11.31² =
  12. 12.29² =
  13. 13.19² =
  14. 14.51² =
  15. 15.29² =
  16. 16.89² =
  17. 17.39² =
  18. 18.19² =
  19. 19.29² =
  20. 20.31² =
  21. 21.91² =
  22. 22.29² =
  23. 23.61² =
  24. 24.91² =
  25. 25.39² =
  26. 26.69² =
  27. 27.49² =
  28. 28.91² =
  29. 29.91² =
  30. 30.29² =
  31. 31.59² =
  32. 32.59² =
  33. 33.29² =
  34. 34.29² =
  35. 35.79² =
  36. 36.41² =
  37. 37.71² =
  38. 38.69² =
  39. 39.31² =
  40. 40.19² =

Answer key

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

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