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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 196 · 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. 2.31² =
  3. 3.69² =
  4. 4.31² =
  5. 5.89² =
  6. 6.41² =
  7. 7.79² =
  8. 8.21² =
  9. 9.19² =
  10. 10.69² =
  11. 11.19² =
  12. 12.89² =
  13. 13.89² =
  14. 14.39² =
  15. 15.21² =
  16. 16.79² =
  17. 17.29² =
  18. 18.61² =
  19. 19.39² =
  20. 20.49² =
  21. 21.19² =
  22. 22.49² =
  23. 23.21² =
  24. 24.29² =
  25. 25.19² =
  26. 26.91² =
  27. 27.91² =
  28. 28.91² =
  29. 29.39² =
  30. 30.91² =
  31. 31.49² =
  32. 32.51² =
  33. 33.91² =
  34. 34.19² =
  35. 35.89² =
  36. 36.49² =
  37. 37.29² =
  38. 38.59² =
  39. 39.29² =
  40. 40.59² =

Answer key

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

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