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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 836 · 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. 2.19² =
  3. 3.89² =
  4. 4.19² =
  5. 5.19² =
  6. 6.51² =
  7. 7.71² =
  8. 8.19² =
  9. 9.59² =
  10. 10.31² =
  11. 11.81² =
  12. 12.61² =
  13. 13.49² =
  14. 14.19² =
  15. 15.31² =
  16. 16.61² =
  17. 17.19² =
  18. 18.29² =
  19. 19.59² =
  20. 20.51² =
  21. 21.91² =
  22. 22.59² =
  23. 23.49² =
  24. 24.21² =
  25. 25.71² =
  26. 26.31² =
  27. 27.51² =
  28. 28.49² =
  29. 29.41² =
  30. 30.21² =
  31. 31.69² =
  32. 32.31² =
  33. 33.29² =
  34. 34.91² =
  35. 35.69² =
  36. 36.79² =
  37. 37.39² =
  38. 38.21² =
  39. 39.29² =
  40. 40.19² =

Answer key

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

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