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1. 看图写加法算式和减法算式。
$□+□=□$
$□-□=□$ $□-□=□$
$□+□=□$
$□-□=□$ $□-□=□$
答案
$9+5=14$
$14-9=5$
$14-5=9$
$14-9=5$
$14-5=9$
2. $5+7=□$
$9+4=□$
$6+5=□$
$12-7=□$
$13-4=□$
$11-5=□$
$12-5=□$
$13-9=□$
$11-6=□$
$9+4=□$
$6+5=□$
$12-7=□$
$13-4=□$
$11-5=□$
$12-5=□$
$13-9=□$
$11-6=□$
答案
5+7
=5+5+2
=10+2
=12
9+4
=9+1+3
=10+3
=13
6+5
=6+4+1
=10+1
=11
12-7
=12-2-5
=10-5
=5
13-4
=13-3-1
=10-1
=9
11-5
=11-1-4
=10-4
=6
12-5
=12-2-3
=10-3
=7
13-9
=13-3-6
=10-6
=4
11-6
=11-1-5
=10-5
=5
=5+5+2
=10+2
=12
9+4
=9+1+3
=10+3
=13
6+5
=6+4+1
=10+1
=11
12-7
=12-2-5
=10-5
=5
13-4
=13-3-1
=10-1
=9
11-5
=11-1-4
=10-4
=6
12-5
=12-2-3
=10-3
=7
13-9
=13-3-6
=10-6
=4
11-6
=11-1-5
=10-5
=5
3. $7+7=$
$18-9=$
$5+4+3=$
$6+9=$
$13-5=$
$16-9+4=$
$8+4=$
$9+7=$
$14-3-5=$
$12-9=$
$11-3=$
$6+6+6=$
$18-9=$
$5+4+3=$
$6+9=$
$13-5=$
$16-9+4=$
$8+4=$
$9+7=$
$14-3-5=$
$12-9=$
$11-3=$
$6+6+6=$
答案
7+7=14
18-9=9
5+4+3
=9+3
=12
6+9=15
13-5=8
16-9+4
=7+4
=11
8+4=12
9+7=16
14-3-5
=11-5
=6
12-9=3
11-3=8
6+6+6
=12+6
=18
18-9=9
5+4+3
=9+3
=12
6+9=15
13-5=8
16-9+4
=7+4
=11
8+4=12
9+7=16
14-3-5
=11-5
=6
12-9=3
11-3=8
6+6+6
=12+6
=18
4. 找规律填数。
答案
14 - 8 = 6
6 + 7 = 13
答：第三个三角形空白处填6，第四个三角形空白处填13。
6 + 7 = 13
答：第三个三角形空白处填6，第四个三角形空白处填13。
