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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 292 · 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. 1.71² =
  2. 2.29² =
  3. 3.51² =
  4. 4.71² =
  5. 5.89² =
  6. 6.49² =
  7. 7.19² =
  8. 8.51² =
  9. 9.29² =
  10. 10.29² =
  11. 11.51² =
  12. 12.61² =
  13. 13.69² =
  14. 14.31² =
  15. 15.31² =
  16. 16.41² =
  17. 17.69² =
  18. 18.21² =
  19. 19.59² =
  20. 20.19² =
  21. 21.79² =
  22. 22.91² =
  23. 23.59² =
  24. 24.39² =
  25. 25.71² =
  26. 26.49² =
  27. 27.21² =
  28. 28.21² =
  29. 29.71² =
  30. 30.31² =
  31. 31.31² =
  32. 32.19² =
  33. 33.51² =
  34. 34.29² =
  35. 35.29² =
  36. 36.39² =
  37. 37.49² =
  38. 38.59² =
  39. 39.39² =
  40. 40.59² =

Answer key

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

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