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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 803 · 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. 2.41² =
  3. 3.71² =
  4. 4.69² =
  5. 5.61² =
  6. 6.81² =
  7. 7.39² =
  8. 8.89² =
  9. 9.81² =
  10. 10.79² =
  11. 11.81² =
  12. 12.31² =
  13. 13.59² =
  14. 14.31² =
  15. 15.89² =
  16. 16.19² =
  17. 17.29² =
  18. 18.29² =
  19. 19.31² =
  20. 20.41² =
  21. 21.71² =
  22. 22.69² =
  23. 23.61² =
  24. 24.39² =
  25. 25.29² =
  26. 26.81² =
  27. 27.19² =
  28. 28.29² =
  29. 29.31² =
  30. 30.59² =
  31. 31.51² =
  32. 32.49² =
  33. 33.91² =
  34. 34.19² =
  35. 35.79² =
  36. 36.61² =
  37. 37.29² =
  38. 38.19² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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