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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 17 · 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. 2.89² =
  3. 3.81² =
  4. 4.89² =
  5. 5.49² =
  6. 6.79² =
  7. 7.41² =
  8. 8.91² =
  9. 9.49² =
  10. 10.79² =
  11. 11.39² =
  12. 12.69² =
  13. 13.59² =
  14. 14.89² =
  15. 15.19² =
  16. 16.29² =
  17. 17.19² =
  18. 18.41² =
  19. 19.19² =
  20. 20.79² =
  21. 21.69² =
  22. 22.19² =
  23. 23.51² =
  24. 24.21² =
  25. 25.69² =
  26. 26.51² =
  27. 27.39² =
  28. 28.29² =
  29. 29.41² =
  30. 30.61² =
  31. 31.29² =
  32. 32.29² =
  33. 33.69² =
  34. 34.51² =
  35. 35.51² =
  36. 36.59² =
  37. 37.39² =
  38. 38.71² =
  39. 39.79² =
  40. 40.91² =

Answer key

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

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