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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 423 · 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. 1.29² =
  2. 2.19² =
  3. 3.69² =
  4. 4.79² =
  5. 5.41² =
  6. 6.31² =
  7. 7.79² =
  8. 8.69² =
  9. 9.69² =
  10. 10.81² =
  11. 11.79² =
  12. 12.21² =
  13. 13.91² =
  14. 14.29² =
  15. 15.29² =
  16. 16.39² =
  17. 17.61² =
  18. 18.81² =
  19. 19.79² =
  20. 20.41² =
  21. 21.31² =
  22. 22.41² =
  23. 23.31² =
  24. 24.41² =
  25. 25.71² =
  26. 26.61² =
  27. 27.21² =
  28. 28.39² =
  29. 29.21² =
  30. 30.39² =
  31. 31.31² =
  32. 32.51² =
  33. 33.21² =
  34. 34.29² =
  35. 35.59² =
  36. 36.61² =
  37. 37.89² =
  38. 38.69² =
  39. 39.41² =
  40. 40.61² =

Answer key

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

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