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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 520 · 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. 1.19² =
  2. 2.61² =
  3. 3.21² =
  4. 4.91² =
  5. 5.61² =
  6. 6.61² =
  7. 7.39² =
  8. 8.21² =
  9. 9.41² =
  10. 10.51² =
  11. 11.29² =
  12. 12.79² =
  13. 13.31² =
  14. 14.41² =
  15. 15.69² =
  16. 16.31² =
  17. 17.51² =
  18. 18.29² =
  19. 19.51² =
  20. 20.19² =
  21. 21.81² =
  22. 22.71² =
  23. 23.61² =
  24. 24.49² =
  25. 25.59² =
  26. 26.89² =
  27. 27.69² =
  28. 28.71² =
  29. 29.21² =
  30. 30.31² =
  31. 31.29² =
  32. 32.51² =
  33. 33.61² =
  34. 34.51² =
  35. 35.41² =
  36. 36.59² =
  37. 37.59² =
  38. 38.61² =
  39. 39.61² =
  40. 40.21² =

Answer key

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

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