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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 1 · 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. 2.31² =
  3. 3.51² =
  4. 4.31² =
  5. 5.59² =
  6. 6.21² =
  7. 7.39² =
  8. 8.51² =
  9. 9.79² =
  10. 10.71² =
  11. 11.41² =
  12. 12.69² =
  13. 13.91² =
  14. 14.81² =
  15. 15.19² =
  16. 16.51² =
  17. 17.49² =
  18. 18.71² =
  19. 19.79² =
  20. 20.51² =
  21. 21.71² =
  22. 22.71² =
  23. 23.21² =
  24. 24.21² =
  25. 25.69² =
  26. 26.51² =
  27. 27.69² =
  28. 28.31² =
  29. 29.69² =
  30. 30.61² =
  31. 31.59² =
  32. 32.31² =
  33. 33.69² =
  34. 34.79² =
  35. 35.29² =
  36. 36.81² =
  37. 37.69² =
  38. 38.59² =
  39. 39.79² =
  40. 40.61² =

Answer key

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

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