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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 387 · 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. 1.69² =
  2. 2.79² =
  3. 3.79² =
  4. 4.19² =
  5. 5.51² =
  6. 6.21² =
  7. 7.51² =
  8. 8.81² =
  9. 9.21² =
  10. 10.21² =
  11. 11.41² =
  12. 12.21² =
  13. 13.79² =
  14. 14.91² =
  15. 15.59² =
  16. 16.61² =
  17. 17.89² =
  18. 18.59² =
  19. 19.29² =
  20. 20.69² =
  21. 21.39² =
  22. 22.29² =
  23. 23.79² =
  24. 24.69² =
  25. 25.21² =
  26. 26.59² =
  27. 27.61² =
  28. 28.29² =
  29. 29.31² =
  30. 30.71² =
  31. 31.39² =
  32. 32.19² =
  33. 33.89² =
  34. 34.69² =
  35. 35.21² =
  36. 36.19² =
  37. 37.71² =
  38. 38.81² =
  39. 39.21² =
  40. 40.71² =

Answer key

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

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