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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 184 · 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. 1.19² =
  2. 2.61² =
  3. 3.69² =
  4. 4.91² =
  5. 5.91² =
  6. 6.71² =
  7. 7.71² =
  8. 8.39² =
  9. 9.31² =
  10. 10.69² =
  11. 11.61² =
  12. 12.21² =
  13. 13.31² =
  14. 14.89² =
  15. 15.51² =
  16. 16.69² =
  17. 17.41² =
  18. 18.81² =
  19. 19.89² =
  20. 20.79² =
  21. 21.31² =
  22. 22.79² =
  23. 23.31² =
  24. 24.79² =
  25. 25.29² =
  26. 26.31² =
  27. 27.89² =
  28. 28.21² =
  29. 29.39² =
  30. 30.71² =
  31. 31.79² =
  32. 32.91² =
  33. 33.71² =
  34. 34.61² =
  35. 35.81² =
  36. 36.81² =
  37. 37.91² =
  38. 38.19² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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