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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 305 · 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. 1.19² =
  2. 2.79² =
  3. 3.21² =
  4. 4.41² =
  5. 5.71² =
  6. 6.69² =
  7. 7.69² =
  8. 8.41² =
  9. 9.19² =
  10. 10.19² =
  11. 11.29² =
  12. 12.71² =
  13. 13.21² =
  14. 14.91² =
  15. 15.19² =
  16. 16.29² =
  17. 17.91² =
  18. 18.71² =
  19. 19.19² =
  20. 20.31² =
  21. 21.39² =
  22. 22.51² =
  23. 23.21² =
  24. 24.59² =
  25. 25.29² =
  26. 26.89² =
  27. 27.81² =
  28. 28.49² =
  29. 29.91² =
  30. 30.31² =
  31. 31.21² =
  32. 32.79² =
  33. 33.31² =
  34. 34.21² =
  35. 35.79² =
  36. 36.79² =
  37. 37.29² =
  38. 38.49² =
  39. 39.29² =
  40. 40.41² =

Answer key

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

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