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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 15 · 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. 1.19² =
  2. 2.19² =
  3. 3.31² =
  4. 4.49² =
  5. 5.61² =
  6. 6.51² =
  7. 7.59² =
  8. 8.61² =
  9. 9.69² =
  10. 10.41² =
  11. 11.39² =
  12. 12.61² =
  13. 13.91² =
  14. 14.19² =
  15. 15.71² =
  16. 16.91² =
  17. 17.79² =
  18. 18.61² =
  19. 19.39² =
  20. 20.69² =
  21. 21.39² =
  22. 22.19² =
  23. 23.39² =
  24. 24.19² =
  25. 25.79² =
  26. 26.39² =
  27. 27.81² =
  28. 28.91² =
  29. 29.19² =
  30. 30.41² =
  31. 31.81² =
  32. 32.39² =
  33. 33.61² =
  34. 34.31² =
  35. 35.71² =
  36. 36.29² =
  37. 37.89² =
  38. 38.91² =
  39. 39.29² =
  40. 40.81² =

Answer key

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

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