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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 177 · 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. 1.49² =
  2. 2.31² =
  3. 3.51² =
  4. 4.79² =
  5. 5.41² =
  6. 6.79² =
  7. 7.31² =
  8. 8.21² =
  9. 9.51² =
  10. 10.19² =
  11. 11.91² =
  12. 12.31² =
  13. 13.41² =
  14. 14.61² =
  15. 15.81² =
  16. 16.79² =
  17. 17.21² =
  18. 18.71² =
  19. 19.19² =
  20. 20.69² =
  21. 21.39² =
  22. 22.89² =
  23. 23.71² =
  24. 24.59² =
  25. 25.51² =
  26. 26.61² =
  27. 27.59² =
  28. 28.51² =
  29. 29.39² =
  30. 30.89² =
  31. 31.29² =
  32. 32.69² =
  33. 33.91² =
  34. 34.89² =
  35. 35.39² =
  36. 36.89² =
  37. 37.39² =
  38. 38.69² =
  39. 39.59² =
  40. 40.69² =

Answer key

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

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