一、算一算。
1. $16 - 3 = □$ $12 + 3 = □$ $9 + 10 = □$ $15 - 5 = □$
$10 + 9 = □$ $14 - 4 = □$ $19 - 3 = □$ $14 + 4 = □$
$15 + 2 = □$ $18 - 8 = □$ $16 - 2 = □$ $11 + 6 = □$
2. $6 + 4 + 5 = □$ $7 + 3 + 9 = □$ $5 + 5 + 7 = □$
$8 + 2 + 7 = □$ $19 - 9 - 3 = □$ $18 - 8 + 2 = □$
$17 - 7 - 2 = □$ $18 - 8 - 4 = □$ $17 - 7 + 5 = □$

1. 13 15 19 10 19 10 16 18 17 10 14 17 2. 15 19 17 17 7 12 8 6 15

二、将得数相同的算式连起来。

三、在$◯$里填上“$＞$”“$＜$”或“$=$”。
$17 + 2 ◯ 20$ $19 - 7 ◯ 10$ $15 + 2 ◯ 7$


$6 + 10 ◯ 6$ $10 + 1 ◯ 11$ $9 + 10 ◯ 19$

＜ ＞ ＞ ＞ = =