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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 486 · 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. 1.29² =
  2. 2.69² =
  3. 3.41² =
  4. 4.41² =
  5. 5.19² =
  6. 6.79² =
  7. 7.19² =
  8. 8.91² =
  9. 9.81² =
  10. 10.71² =
  11. 11.61² =
  12. 12.59² =
  13. 13.31² =
  14. 14.31² =
  15. 15.41² =
  16. 16.19² =
  17. 17.49² =
  18. 18.61² =
  19. 19.91² =
  20. 20.39² =
  21. 21.61² =
  22. 22.51² =
  23. 23.69² =
  24. 24.41² =
  25. 25.21² =
  26. 26.21² =
  27. 27.39² =
  28. 28.61² =
  29. 29.69² =
  30. 30.61² =
  31. 31.91² =
  32. 32.71² =
  33. 33.41² =
  34. 34.39² =
  35. 35.91² =
  36. 36.31² =
  37. 37.49² =
  38. 38.79² =
  39. 39.81² =
  40. 40.59² =

Answer key

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

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