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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 20 · 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. 1.31² =
  2. 2.71² =
  3. 3.19² =
  4. 4.91² =
  5. 5.49² =
  6. 6.89² =
  7. 7.69² =
  8. 8.19² =
  9. 9.59² =
  10. 10.19² =
  11. 11.19² =
  12. 12.89² =
  13. 13.91² =
  14. 14.19² =
  15. 15.51² =
  16. 16.91² =
  17. 17.69² =
  18. 18.29² =
  19. 19.69² =
  20. 20.39² =
  21. 21.21² =
  22. 22.89² =
  23. 23.19² =
  24. 24.71² =
  25. 25.91² =
  26. 26.71² =
  27. 27.69² =
  28. 28.29² =
  29. 29.61² =
  30. 30.91² =
  31. 31.41² =
  32. 32.19² =
  33. 33.39² =
  34. 34.49² =
  35. 35.59² =
  36. 36.29² =
  37. 37.39² =
  38. 38.49² =
  39. 39.51² =
  40. 40.69² =

Answer key

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

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