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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 562 · 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. 1.21² =
  2. 2.61² =
  3. 3.21² =
  4. 4.91² =
  5. 5.31² =
  6. 6.69² =
  7. 7.59² =
  8. 8.49² =
  9. 9.59² =
  10. 10.19² =
  11. 11.31² =
  12. 12.79² =
  13. 13.39² =
  14. 14.39² =
  15. 15.69² =
  16. 16.51² =
  17. 17.29² =
  18. 18.71² =
  19. 19.61² =
  20. 20.89² =
  21. 21.61² =
  22. 22.39² =
  23. 23.29² =
  24. 24.31² =
  25. 25.21² =
  26. 26.21² =
  27. 27.89² =
  28. 28.71² =
  29. 29.29² =
  30. 30.89² =
  31. 31.71² =
  32. 32.49² =
  33. 33.51² =
  34. 34.71² =
  35. 35.39² =
  36. 36.39² =
  37. 37.51² =
  38. 38.49² =
  39. 39.49² =
  40. 40.69² =

Answer key

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

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