← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 584 · 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. 2.19² =
  3. 3.41² =
  4. 4.31² =
  5. 5.29² =
  6. 6.79² =
  7. 7.29² =
  8. 8.39² =
  9. 9.41² =
  10. 10.29² =
  11. 11.39² =
  12. 12.91² =
  13. 13.39² =
  14. 14.39² =
  15. 15.81² =
  16. 16.69² =
  17. 17.91² =
  18. 18.29² =
  19. 19.69² =
  20. 20.79² =
  21. 21.69² =
  22. 22.61² =
  23. 23.89² =
  24. 24.51² =
  25. 25.79² =
  26. 26.89² =
  27. 27.41² =
  28. 28.21² =
  29. 29.69² =
  30. 30.41² =
  31. 31.29² =
  32. 32.49² =
  33. 33.61² =
  34. 34.29² =
  35. 35.69² =
  36. 36.21² =
  37. 37.71² =
  38. 38.91² =
  39. 39.81² =
  40. 40.51² =

Answer key

  1. 6241
  2. 361
  3. 1681
  4. 961
  5. 841
  6. 6241
  7. 841
  8. 1521
  9. 1681
  10. 841
  11. 1521
  12. 8281
  13. 1521
  14. 1521
  15. 6561
  16. 4761
  17. 8281
  18. 841
  19. 4761
  20. 6241
  21. 4761
  22. 3721
  23. 7921
  24. 2601
  25. 6241
  26. 7921
  27. 1681
  28. 441
  29. 4761
  30. 1681
  31. 841
  32. 2401
  33. 3721
  34. 841
  35. 4761
  36. 441
  37. 5041
  38. 8281
  39. 6561
  40. 2601

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths