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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 794 · 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. 1.59² =
  2. 2.69² =
  3. 3.91² =
  4. 4.59² =
  5. 5.69² =
  6. 6.19² =
  7. 7.59² =
  8. 8.91² =
  9. 9.31² =
  10. 10.51² =
  11. 11.61² =
  12. 12.41² =
  13. 13.69² =
  14. 14.59² =
  15. 15.59² =
  16. 16.59² =
  17. 17.39² =
  18. 18.61² =
  19. 19.51² =
  20. 20.51² =
  21. 21.81² =
  22. 22.29² =
  23. 23.29² =
  24. 24.69² =
  25. 25.21² =
  26. 26.81² =
  27. 27.61² =
  28. 28.89² =
  29. 29.51² =
  30. 30.29² =
  31. 31.49² =
  32. 32.91² =
  33. 33.19² =
  34. 34.19² =
  35. 35.29² =
  36. 36.41² =
  37. 37.71² =
  38. 38.29² =
  39. 39.81² =
  40. 40.89² =

Answer key

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

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