一、口算。
$7 + 9 =$ $19 - 6 =$ $7 + 5 - 8 =$
$16 - 3 =$ $9 + 10 =$ $17 - 7 + 3 =$
$10 + 5 =$ $11 - 4 =$ $4 + 3 + 9 =$
$15 - 6 =$ $5 + 8 =$ $11 - 5 + 8 =$
$19 - 4 =$ $13 - 5 =$ $8 + 8 - 7 =$
$14 - 9 =$ $3 + 8 =$ $14 - 8 + 4 =$
$1 + 12 =$ $11 - 7 =$ $18 - 8 - 9 =$
$18 - 7 =$ $7 + 7 =$ $2 + 14 - 6 =$
$12 - 4 =$ $2 + 17 =$ $8 - 4 + 7 =$
$5 + 9 =$ $17 - 8 =$ $6 + 4 + 5 =$

一、16 13 4 13 19 13 15 7 16 9 13 14 15 8 9 5 11 10 13 4 1 11 14 10 8 19 11 14 9 15

二、在$◯$里填“＞”“＜”或“=”。
$13 - 8◯8$ $10 + 1◯12$ $6 + 9◯19 - 2$
$6 + 7◯14$ $15 - 9◯6$ $15 - 8◯13 - 9$
$14 - 8◯7$ $9 + 9◯16$ $14 - 6◯16 - 8$

二、＜ ＜ ＜ ＜ = ＞ ＜ ＞ =