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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 655 · 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. 1.79² =
  2. 2.39² =
  3. 3.69² =
  4. 4.61² =
  5. 5.71² =
  6. 6.79² =
  7. 7.29² =
  8. 8.91² =
  9. 9.71² =
  10. 10.31² =
  11. 11.29² =
  12. 12.39² =
  13. 13.79² =
  14. 14.59² =
  15. 15.21² =
  16. 16.71² =
  17. 17.21² =
  18. 18.59² =
  19. 19.79² =
  20. 20.59² =
  21. 21.49² =
  22. 22.39² =
  23. 23.21² =
  24. 24.29² =
  25. 25.79² =
  26. 26.79² =
  27. 27.31² =
  28. 28.61² =
  29. 29.71² =
  30. 30.21² =
  31. 31.21² =
  32. 32.61² =
  33. 33.81² =
  34. 34.61² =
  35. 35.21² =
  36. 36.51² =
  37. 37.89² =
  38. 38.51² =
  39. 39.81² =
  40. 40.69² =

Answer key

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

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