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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 482 · 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. 2.19² =
  3. 3.61² =
  4. 4.21² =
  5. 5.59² =
  6. 6.81² =
  7. 7.89² =
  8. 8.51² =
  9. 9.41² =
  10. 10.69² =
  11. 11.51² =
  12. 12.29² =
  13. 13.81² =
  14. 14.69² =
  15. 15.49² =
  16. 16.61² =
  17. 17.71² =
  18. 18.39² =
  19. 19.81² =
  20. 20.69² =
  21. 21.69² =
  22. 22.49² =
  23. 23.41² =
  24. 24.91² =
  25. 25.81² =
  26. 26.71² =
  27. 27.49² =
  28. 28.91² =
  29. 29.59² =
  30. 30.89² =
  31. 31.41² =
  32. 32.89² =
  33. 33.89² =
  34. 34.41² =
  35. 35.61² =
  36. 36.71² =
  37. 37.51² =
  38. 38.29² =
  39. 39.69² =
  40. 40.69² =

Answer key

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

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