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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 654 · 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. 2.91² =
  3. 3.91² =
  4. 4.29² =
  5. 5.19² =
  6. 6.61² =
  7. 7.79² =
  8. 8.21² =
  9. 9.21² =
  10. 10.61² =
  11. 11.79² =
  12. 12.19² =
  13. 13.21² =
  14. 14.29² =
  15. 15.31² =
  16. 16.31² =
  17. 17.19² =
  18. 18.71² =
  19. 19.79² =
  20. 20.89² =
  21. 21.91² =
  22. 22.59² =
  23. 23.51² =
  24. 24.39² =
  25. 25.21² =
  26. 26.61² =
  27. 27.19² =
  28. 28.31² =
  29. 29.29² =
  30. 30.49² =
  31. 31.31² =
  32. 32.69² =
  33. 33.21² =
  34. 34.49² =
  35. 35.41² =
  36. 36.29² =
  37. 37.29² =
  38. 38.59² =
  39. 39.29² =
  40. 40.71² =

Answer key

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

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