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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 645 · 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. 1.89² =
  2. 2.71² =
  3. 3.49² =
  4. 4.51² =
  5. 5.51² =
  6. 6.61² =
  7. 7.91² =
  8. 8.59² =
  9. 9.39² =
  10. 10.39² =
  11. 11.61² =
  12. 12.79² =
  13. 13.69² =
  14. 14.81² =
  15. 15.81² =
  16. 16.89² =
  17. 17.39² =
  18. 18.29² =
  19. 19.21² =
  20. 20.91² =
  21. 21.19² =
  22. 22.19² =
  23. 23.71² =
  24. 24.19² =
  25. 25.19² =
  26. 26.69² =
  27. 27.49² =
  28. 28.31² =
  29. 29.61² =
  30. 30.19² =
  31. 31.39² =
  32. 32.69² =
  33. 33.71² =
  34. 34.29² =
  35. 35.41² =
  36. 36.51² =
  37. 37.29² =
  38. 38.21² =
  39. 39.91² =
  40. 40.61² =

Answer key

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

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