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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 130 · 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. 1.61² =
  2. 2.59² =
  3. 3.79² =
  4. 4.21² =
  5. 5.19² =
  6. 6.19² =
  7. 7.51² =
  8. 8.19² =
  9. 9.29² =
  10. 10.79² =
  11. 11.79² =
  12. 12.61² =
  13. 13.89² =
  14. 14.69² =
  15. 15.89² =
  16. 16.91² =
  17. 17.81² =
  18. 18.51² =
  19. 19.31² =
  20. 20.61² =
  21. 21.51² =
  22. 22.79² =
  23. 23.51² =
  24. 24.79² =
  25. 25.39² =
  26. 26.91² =
  27. 27.41² =
  28. 28.79² =
  29. 29.79² =
  30. 30.71² =
  31. 31.29² =
  32. 32.29² =
  33. 33.61² =
  34. 34.81² =
  35. 35.21² =
  36. 36.41² =
  37. 37.61² =
  38. 38.29² =
  39. 39.21² =
  40. 40.69² =

Answer key

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

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