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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 865 · 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. 1.31² =
  2. 2.19² =
  3. 3.61² =
  4. 4.71² =
  5. 5.51² =
  6. 6.61² =
  7. 7.49² =
  8. 8.49² =
  9. 9.39² =
  10. 10.49² =
  11. 11.41² =
  12. 12.61² =
  13. 13.19² =
  14. 14.89² =
  15. 15.21² =
  16. 16.91² =
  17. 17.61² =
  18. 18.31² =
  19. 19.29² =
  20. 20.41² =
  21. 21.21² =
  22. 22.19² =
  23. 23.81² =
  24. 24.69² =
  25. 25.61² =
  26. 26.39² =
  27. 27.39² =
  28. 28.71² =
  29. 29.69² =
  30. 30.19² =
  31. 31.69² =
  32. 32.49² =
  33. 33.61² =
  34. 34.39² =
  35. 35.29² =
  36. 36.61² =
  37. 37.81² =
  38. 38.79² =
  39. 39.81² =
  40. 40.59² =

Answer key

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

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