3.1.2 Simple Addition

Remember:

$+$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$
$1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$ $11$
$3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$ $11$ $12$
$4$ $5$ $6$ $7$ $8$ $9$ $10$ $11$ $12$ $13$
$5$ $6$ $7$ $8$ $9$ $10$ $11$ $12$ $13$ $14$
$6$ $7$ $8$ $9$ $10$ $11$ $12$ $13$ $14$ $15$
$7$ $8$ $9$ $10$ $11$ $12$ $13$ $14$ $15$ $16$
$8$ $9$ $10$ $11$ $12$ $13$ $14$ $15$ $16$ $17$
$9$ $10$ $11$ $12$ $13$ $14$ $15$ $16$ $17$ $18$

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