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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 553 · 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. 1.69² =
  2. 2.41² =
  3. 3.29² =
  4. 4.91² =
  5. 5.29² =
  6. 6.69² =
  7. 7.69² =
  8. 8.71² =
  9. 9.39² =
  10. 10.71² =
  11. 11.39² =
  12. 12.29² =
  13. 13.39² =
  14. 14.41² =
  15. 15.81² =
  16. 16.49² =
  17. 17.51² =
  18. 18.89² =
  19. 19.19² =
  20. 20.39² =
  21. 21.41² =
  22. 22.19² =
  23. 23.61² =
  24. 24.81² =
  25. 25.39² =
  26. 26.19² =
  27. 27.59² =
  28. 28.41² =
  29. 29.59² =
  30. 30.29² =
  31. 31.91² =
  32. 32.39² =
  33. 33.89² =
  34. 34.39² =
  35. 35.49² =
  36. 36.41² =
  37. 37.71² =
  38. 38.71² =
  39. 39.49² =
  40. 40.61² =

Answer key

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

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