← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 986 · 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. 3.29² =
  4. 4.39² =
  5. 5.61² =
  6. 6.69² =
  7. 7.31² =
  8. 8.79² =
  9. 9.81² =
  10. 10.59² =
  11. 11.29² =
  12. 12.91² =
  13. 13.89² =
  14. 14.49² =
  15. 15.19² =
  16. 16.81² =
  17. 17.39² =
  18. 18.81² =
  19. 19.19² =
  20. 20.19² =
  21. 21.79² =
  22. 22.59² =
  23. 23.49² =
  24. 24.31² =
  25. 25.69² =
  26. 26.21² =
  27. 27.69² =
  28. 28.69² =
  29. 29.31² =
  30. 30.71² =
  31. 31.31² =
  32. 32.21² =
  33. 33.51² =
  34. 34.49² =
  35. 35.59² =
  36. 36.79² =
  37. 37.69² =
  38. 38.59² =
  39. 39.69² =
  40. 40.29² =

Answer key

  1. 6241
  2. 361
  3. 841
  4. 1521
  5. 3721
  6. 4761
  7. 961
  8. 6241
  9. 6561
  10. 3481
  11. 841
  12. 8281
  13. 7921
  14. 2401
  15. 361
  16. 6561
  17. 1521
  18. 6561
  19. 361
  20. 361
  21. 6241
  22. 3481
  23. 2401
  24. 961
  25. 4761
  26. 441
  27. 4761
  28. 4761
  29. 961
  30. 5041
  31. 961
  32. 441
  33. 2601
  34. 2401
  35. 3481
  36. 6241
  37. 4761
  38. 3481
  39. 4761
  40. 841

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