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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 851 · 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. 1.79² =
  2. 2.19² =
  3. 3.31² =
  4. 4.81² =
  5. 5.19² =
  6. 6.69² =
  7. 7.79² =
  8. 8.41² =
  9. 9.51² =
  10. 10.79² =
  11. 11.31² =
  12. 12.81² =
  13. 13.89² =
  14. 14.91² =
  15. 15.59² =
  16. 16.29² =
  17. 17.61² =
  18. 18.69² =
  19. 19.79² =
  20. 20.61² =
  21. 21.39² =
  22. 22.29² =
  23. 23.69² =
  24. 24.51² =
  25. 25.49² =
  26. 26.31² =
  27. 27.69² =
  28. 28.19² =
  29. 29.21² =
  30. 30.81² =
  31. 31.71² =
  32. 32.19² =
  33. 33.39² =
  34. 34.29² =
  35. 35.31² =
  36. 36.71² =
  37. 37.89² =
  38. 38.21² =
  39. 39.51² =
  40. 40.39² =

Answer key

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

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