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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 385 · 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. 1.91² =
  2. 2.19² =
  3. 3.81² =
  4. 4.81² =
  5. 5.61² =
  6. 6.69² =
  7. 7.81² =
  8. 8.39² =
  9. 9.61² =
  10. 10.79² =
  11. 11.29² =
  12. 12.51² =
  13. 13.29² =
  14. 14.41² =
  15. 15.39² =
  16. 16.51² =
  17. 17.51² =
  18. 18.61² =
  19. 19.71² =
  20. 20.71² =
  21. 21.69² =
  22. 22.21² =
  23. 23.51² =
  24. 24.49² =
  25. 25.59² =
  26. 26.29² =
  27. 27.59² =
  28. 28.59² =
  29. 29.39² =
  30. 30.39² =
  31. 31.79² =
  32. 32.71² =
  33. 33.61² =
  34. 34.69² =
  35. 35.19² =
  36. 36.31² =
  37. 37.59² =
  38. 38.31² =
  39. 39.29² =
  40. 40.91² =

Answer key

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

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