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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 5 · 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. 1.51² =
  2. 2.69² =
  3. 3.21² =
  4. 4.21² =
  5. 5.19² =
  6. 6.91² =
  7. 7.31² =
  8. 8.61² =
  9. 9.39² =
  10. 10.71² =
  11. 11.71² =
  12. 12.91² =
  13. 13.29² =
  14. 14.31² =
  15. 15.51² =
  16. 16.71² =
  17. 17.59² =
  18. 18.81² =
  19. 19.19² =
  20. 20.31² =
  21. 21.69² =
  22. 22.29² =
  23. 23.41² =
  24. 24.41² =
  25. 25.29² =
  26. 26.31² =
  27. 27.19² =
  28. 28.89² =
  29. 29.59² =
  30. 30.31² =
  31. 31.79² =
  32. 32.81² =
  33. 33.59² =
  34. 34.19² =
  35. 35.41² =
  36. 36.29² =
  37. 37.81² =
  38. 38.19² =
  39. 39.91² =
  40. 40.39² =

Answer key

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

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