← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 576 · 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. 1.69² =
  2. 2.79² =
  3. 3.51² =
  4. 4.21² =
  5. 5.59² =
  6. 6.71² =
  7. 7.51² =
  8. 8.81² =
  9. 9.21² =
  10. 10.39² =
  11. 11.21² =
  12. 12.61² =
  13. 13.89² =
  14. 14.29² =
  15. 15.69² =
  16. 16.79² =
  17. 17.51² =
  18. 18.61² =
  19. 19.91² =
  20. 20.19² =
  21. 21.91² =
  22. 22.89² =
  23. 23.81² =
  24. 24.61² =
  25. 25.81² =
  26. 26.21² =
  27. 27.79² =
  28. 28.19² =
  29. 29.61² =
  30. 30.91² =
  31. 31.41² =
  32. 32.79² =
  33. 33.29² =
  34. 34.79² =
  35. 35.91² =
  36. 36.71² =
  37. 37.19² =
  38. 38.51² =
  39. 39.79² =
  40. 40.19² =

Answer key

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

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