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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 474 · 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. 1.69² =
  2. 2.29² =
  3. 3.81² =
  4. 4.59² =
  5. 5.51² =
  6. 6.59² =
  7. 7.71² =
  8. 8.61² =
  9. 9.81² =
  10. 10.31² =
  11. 11.91² =
  12. 12.69² =
  13. 13.81² =
  14. 14.79² =
  15. 15.71² =
  16. 16.41² =
  17. 17.31² =
  18. 18.41² =
  19. 19.69² =
  20. 20.31² =
  21. 21.79² =
  22. 22.61² =
  23. 23.81² =
  24. 24.41² =
  25. 25.49² =
  26. 26.29² =
  27. 27.79² =
  28. 28.69² =
  29. 29.39² =
  30. 30.69² =
  31. 31.19² =
  32. 32.79² =
  33. 33.21² =
  34. 34.29² =
  35. 35.59² =
  36. 36.29² =
  37. 37.59² =
  38. 38.91² =
  39. 39.19² =
  40. 40.41² =

Answer key

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

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