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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 347 · 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. 2.49² =
  3. 3.89² =
  4. 4.81² =
  5. 5.71² =
  6. 6.31² =
  7. 7.89² =
  8. 8.81² =
  9. 9.21² =
  10. 10.41² =
  11. 11.39² =
  12. 12.39² =
  13. 13.89² =
  14. 14.59² =
  15. 15.71² =
  16. 16.19² =
  17. 17.49² =
  18. 18.29² =
  19. 19.21² =
  20. 20.21² =
  21. 21.39² =
  22. 22.29² =
  23. 23.41² =
  24. 24.81² =
  25. 25.61² =
  26. 26.29² =
  27. 27.29² =
  28. 28.71² =
  29. 29.49² =
  30. 30.89² =
  31. 31.71² =
  32. 32.21² =
  33. 33.91² =
  34. 34.51² =
  35. 35.29² =
  36. 36.91² =
  37. 37.39² =
  38. 38.41² =
  39. 39.79² =
  40. 40.39² =

Answer key

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

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