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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 269 · 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. 2.91² =
  3. 3.61² =
  4. 4.71² =
  5. 5.39² =
  6. 6.39² =
  7. 7.81² =
  8. 8.79² =
  9. 9.21² =
  10. 10.31² =
  11. 11.29² =
  12. 12.81² =
  13. 13.29² =
  14. 14.31² =
  15. 15.31² =
  16. 16.29² =
  17. 17.19² =
  18. 18.41² =
  19. 19.39² =
  20. 20.59² =
  21. 21.59² =
  22. 22.91² =
  23. 23.71² =
  24. 24.81² =
  25. 25.41² =
  26. 26.49² =
  27. 27.51² =
  28. 28.31² =
  29. 29.89² =
  30. 30.39² =
  31. 31.59² =
  32. 32.31² =
  33. 33.79² =
  34. 34.69² =
  35. 35.21² =
  36. 36.39² =
  37. 37.81² =
  38. 38.81² =
  39. 39.61² =
  40. 40.71² =

Answer key

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

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