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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 287 · 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. 1.59² =
  2. 2.31² =
  3. 3.31² =
  4. 4.69² =
  5. 5.71² =
  6. 6.81² =
  7. 7.29² =
  8. 8.19² =
  9. 9.49² =
  10. 10.89² =
  11. 11.79² =
  12. 12.91² =
  13. 13.49² =
  14. 14.79² =
  15. 15.61² =
  16. 16.21² =
  17. 17.21² =
  18. 18.21² =
  19. 19.71² =
  20. 20.29² =
  21. 21.71² =
  22. 22.39² =
  23. 23.39² =
  24. 24.31² =
  25. 25.31² =
  26. 26.89² =
  27. 27.19² =
  28. 28.69² =
  29. 29.39² =
  30. 30.89² =
  31. 31.29² =
  32. 32.69² =
  33. 33.51² =
  34. 34.29² =
  35. 35.49² =
  36. 36.91² =
  37. 37.61² =
  38. 38.89² =
  39. 39.39² =
  40. 40.89² =

Answer key

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

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