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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 697 · 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. 1.19² =
  2. 2.61² =
  3. 3.19² =
  4. 4.39² =
  5. 5.29² =
  6. 6.79² =
  7. 7.61² =
  8. 8.19² =
  9. 9.31² =
  10. 10.79² =
  11. 11.29² =
  12. 12.41² =
  13. 13.39² =
  14. 14.71² =
  15. 15.59² =
  16. 16.89² =
  17. 17.41² =
  18. 18.91² =
  19. 19.71² =
  20. 20.81² =
  21. 21.31² =
  22. 22.89² =
  23. 23.49² =
  24. 24.51² =
  25. 25.29² =
  26. 26.41² =
  27. 27.61² =
  28. 28.59² =
  29. 29.21² =
  30. 30.91² =
  31. 31.91² =
  32. 32.49² =
  33. 33.69² =
  34. 34.59² =
  35. 35.19² =
  36. 36.19² =
  37. 37.79² =
  38. 38.61² =
  39. 39.69² =
  40. 40.69² =

Answer key

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

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