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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 144 · 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. 1.59² =
  2. 2.39² =
  3. 3.79² =
  4. 4.21² =
  5. 5.91² =
  6. 6.19² =
  7. 7.21² =
  8. 8.89² =
  9. 9.71² =
  10. 10.59² =
  11. 11.39² =
  12. 12.39² =
  13. 13.21² =
  14. 14.39² =
  15. 15.79² =
  16. 16.21² =
  17. 17.59² =
  18. 18.31² =
  19. 19.19² =
  20. 20.79² =
  21. 21.39² =
  22. 22.41² =
  23. 23.81² =
  24. 24.71² =
  25. 25.29² =
  26. 26.59² =
  27. 27.29² =
  28. 28.61² =
  29. 29.21² =
  30. 30.81² =
  31. 31.51² =
  32. 32.79² =
  33. 33.69² =
  34. 34.69² =
  35. 35.21² =
  36. 36.29² =
  37. 37.51² =
  38. 38.59² =
  39. 39.91² =
  40. 40.81² =

Answer key

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

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