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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 511 · 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. 2.21² =
  3. 3.61² =
  4. 4.91² =
  5. 5.49² =
  6. 6.81² =
  7. 7.41² =
  8. 8.49² =
  9. 9.41² =
  10. 10.61² =
  11. 11.31² =
  12. 12.49² =
  13. 13.69² =
  14. 14.31² =
  15. 15.69² =
  16. 16.39² =
  17. 17.41² =
  18. 18.31² =
  19. 19.59² =
  20. 20.71² =
  21. 21.91² =
  22. 22.19² =
  23. 23.39² =
  24. 24.79² =
  25. 25.79² =
  26. 26.89² =
  27. 27.91² =
  28. 28.81² =
  29. 29.51² =
  30. 30.31² =
  31. 31.21² =
  32. 32.81² =
  33. 33.19² =
  34. 34.29² =
  35. 35.31² =
  36. 36.19² =
  37. 37.69² =
  38. 38.19² =
  39. 39.29² =
  40. 40.59² =

Answer key

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

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