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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 856 · 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. 1.89² =
  2. 2.79² =
  3. 3.71² =
  4. 4.79² =
  5. 5.29² =
  6. 6.79² =
  7. 7.69² =
  8. 8.29² =
  9. 9.61² =
  10. 10.91² =
  11. 11.79² =
  12. 12.21² =
  13. 13.89² =
  14. 14.39² =
  15. 15.39² =
  16. 16.31² =
  17. 17.31² =
  18. 18.19² =
  19. 19.39² =
  20. 20.71² =
  21. 21.69² =
  22. 22.51² =
  23. 23.31² =
  24. 24.59² =
  25. 25.29² =
  26. 26.31² =
  27. 27.31² =
  28. 28.79² =
  29. 29.59² =
  30. 30.39² =
  31. 31.91² =
  32. 32.51² =
  33. 33.59² =
  34. 34.69² =
  35. 35.89² =
  36. 36.19² =
  37. 37.51² =
  38. 38.41² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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