Question
Add and Subtract
| $ $ |
$6 8$ | $ $ |
$ $ |
$3 9$ | $ $ |
$ $ |
$8 0$ |
| $+$ | $1 3$ | $ $ |
$+$ | $1 9$ | $ $ |
$−$ | $6 7$ |

____ strings of ten beads and ____ loose beads make ____ beads.


