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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 853 · 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. 2.59² =
  3. 3.41² =
  4. 4.91² =
  5. 5.61² =
  6. 6.91² =
  7. 7.89² =
  8. 8.81² =
  9. 9.51² =
  10. 10.59² =
  11. 11.69² =
  12. 12.19² =
  13. 13.19² =
  14. 14.29² =
  15. 15.41² =
  16. 16.91² =
  17. 17.49² =
  18. 18.21² =
  19. 19.69² =
  20. 20.81² =
  21. 21.41² =
  22. 22.49² =
  23. 23.29² =
  24. 24.79² =
  25. 25.61² =
  26. 26.29² =
  27. 27.71² =
  28. 28.81² =
  29. 29.69² =
  30. 30.69² =
  31. 31.69² =
  32. 32.91² =
  33. 33.19² =
  34. 34.39² =
  35. 35.69² =
  36. 36.39² =
  37. 37.31² =
  38. 38.21² =
  39. 39.71² =
  40. 40.61² =

Answer key

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

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