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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 874 · 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. 1.79² =
  2. 2.69² =
  3. 3.49² =
  4. 4.59² =
  5. 5.79² =
  6. 6.21² =
  7. 7.49² =
  8. 8.79² =
  9. 9.39² =
  10. 10.31² =
  11. 11.91² =
  12. 12.21² =
  13. 13.39² =
  14. 14.59² =
  15. 15.89² =
  16. 16.71² =
  17. 17.51² =
  18. 18.71² =
  19. 19.61² =
  20. 20.19² =
  21. 21.21² =
  22. 22.31² =
  23. 23.51² =
  24. 24.79² =
  25. 25.31² =
  26. 26.39² =
  27. 27.41² =
  28. 28.71² =
  29. 29.71² =
  30. 30.71² =
  31. 31.61² =
  32. 32.31² =
  33. 33.91² =
  34. 34.61² =
  35. 35.59² =
  36. 36.69² =
  37. 37.19² =
  38. 38.71² =
  39. 39.21² =
  40. 40.49² =

Answer key

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

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