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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 188 · 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. 1.21² =
  2. 2.39² =
  3. 3.51² =
  4. 4.49² =
  5. 5.19² =
  6. 6.79² =
  7. 7.29² =
  8. 8.19² =
  9. 9.39² =
  10. 10.81² =
  11. 11.81² =
  12. 12.49² =
  13. 13.61² =
  14. 14.39² =
  15. 15.49² =
  16. 16.59² =
  17. 17.61² =
  18. 18.19² =
  19. 19.51² =
  20. 20.69² =
  21. 21.61² =
  22. 22.71² =
  23. 23.79² =
  24. 24.71² =
  25. 25.21² =
  26. 26.91² =
  27. 27.41² =
  28. 28.79² =
  29. 29.91² =
  30. 30.29² =
  31. 31.29² =
  32. 32.39² =
  33. 33.41² =
  34. 34.79² =
  35. 35.29² =
  36. 36.21² =
  37. 37.81² =
  38. 38.69² =
  39. 39.59² =
  40. 40.71² =

Answer key

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

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