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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 271 · 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. 1.49² =
  2. 2.51² =
  3. 3.19² =
  4. 4.69² =
  5. 5.59² =
  6. 6.39² =
  7. 7.81² =
  8. 8.61² =
  9. 9.89² =
  10. 10.21² =
  11. 11.49² =
  12. 12.49² =
  13. 13.91² =
  14. 14.19² =
  15. 15.49² =
  16. 16.41² =
  17. 17.29² =
  18. 18.71² =
  19. 19.81² =
  20. 20.49² =
  21. 21.69² =
  22. 22.89² =
  23. 23.39² =
  24. 24.49² =
  25. 25.79² =
  26. 26.69² =
  27. 27.79² =
  28. 28.61² =
  29. 29.19² =
  30. 30.41² =
  31. 31.39² =
  32. 32.21² =
  33. 33.41² =
  34. 34.49² =
  35. 35.39² =
  36. 36.79² =
  37. 37.29² =
  38. 38.21² =
  39. 39.71² =
  40. 40.69² =

Answer key

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

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