Question
Fill in the missing numbers.



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| $ $ |
$4 6$ | $ $ |
$4 4$ | $ $ |
$3 0$ | ||
| $+$ | $1 2$ | $+$ | $1 5$ | $+$ | $1 8$ | ||






| $ $ |
$8$ | $ $ |
$8$ | $ $ |
$ $ |
$7$ | |
| $+$ | $8$ | $+$ | $2$ | $ $ |
$+$ | $6$ | |
| $+$ | $9$ | $+$ | $0$ | $ $ |
$+$ | $9$ | |
| $ $ |
$8 6$ | $ $ |
$ $ |
$7 7$ | $ $ |
$ $ |
$8 7$ |
| $−$ | $4 5$ | $ $ |
$−$ | $6 4$ | $ $ |
$−$ | $5 2$ |
