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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 375 · 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. 2.31² =
  3. 3.89² =
  4. 4.69² =
  5. 5.39² =
  6. 6.91² =
  7. 7.21² =
  8. 8.49² =
  9. 9.89² =
  10. 10.71² =
  11. 11.49² =
  12. 12.41² =
  13. 13.71² =
  14. 14.69² =
  15. 15.19² =
  16. 16.41² =
  17. 17.69² =
  18. 18.69² =
  19. 19.59² =
  20. 20.19² =
  21. 21.29² =
  22. 22.79² =
  23. 23.39² =
  24. 24.79² =
  25. 25.61² =
  26. 26.51² =
  27. 27.19² =
  28. 28.71² =
  29. 29.39² =
  30. 30.91² =
  31. 31.61² =
  32. 32.49² =
  33. 33.51² =
  34. 34.61² =
  35. 35.81² =
  36. 36.71² =
  37. 37.81² =
  38. 38.49² =
  39. 39.81² =
  40. 40.69² =

Answer key

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

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