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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 194 · 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. 2.91² =
  3. 3.59² =
  4. 4.39² =
  5. 5.69² =
  6. 6.41² =
  7. 7.29² =
  8. 8.69² =
  9. 9.91² =
  10. 10.21² =
  11. 11.31² =
  12. 12.71² =
  13. 13.41² =
  14. 14.21² =
  15. 15.29² =
  16. 16.31² =
  17. 17.79² =
  18. 18.31² =
  19. 19.21² =
  20. 20.39² =
  21. 21.21² =
  22. 22.69² =
  23. 23.79² =
  24. 24.29² =
  25. 25.19² =
  26. 26.41² =
  27. 27.69² =
  28. 28.91² =
  29. 29.29² =
  30. 30.61² =
  31. 31.31² =
  32. 32.39² =
  33. 33.51² =
  34. 34.41² =
  35. 35.29² =
  36. 36.19² =
  37. 37.69² =
  38. 38.39² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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