1. $5 + 7 =$ $4 + 9 =$ $3 + 9 =$
$12 - 5 =$ $13 - 4 =$ $12 - 3 =$
$12 - 7 =$ $13 - 9 =$ $12 - 9 =$
$6 + 9 =$ $5 + 8 =$ $4 + 7 =$
$15 - 6 =$ $13 - 5 =$ $11 - 4 =$
$15 - 9 =$ $13 - 8 =$ $11 - 7 =$
$12 - 5 =$ $13 - 4 =$ $12 - 3 =$
$12 - 7 =$ $13 - 9 =$ $12 - 9 =$
$6 + 9 =$ $5 + 8 =$ $4 + 7 =$
$15 - 6 =$ $13 - 5 =$ $11 - 4 =$
$15 - 9 =$ $13 - 8 =$ $11 - 7 =$
答案
1.
$5 + 7 = 12$
$4 + 9 = 13$
$3 + 9 = 12$
$12 - 5 = 7$
$13 - 4 = 9$
$12 - 3 = 9$
$12 - 7 = 5$
$13 - 9 = 4$
$12 - 9 = 3$
$6 + 9 = 15$
$5 + 8 = 13$
$4 + 7 = 11$
$15 - 6 = 9$
$13 - 5 = 8$
$11 - 4 = 7$
$15 - 9 = 6$
$13 - 8 = 5$
$11 - 7 = 4$
$5 + 7 = 12$
$4 + 9 = 13$
$3 + 9 = 12$
$12 - 5 = 7$
$13 - 4 = 9$
$12 - 3 = 9$
$12 - 7 = 5$
$13 - 9 = 4$
$12 - 9 = 3$
$6 + 9 = 15$
$5 + 8 = 13$
$4 + 7 = 11$
$15 - 6 = 9$
$13 - 5 = 8$
$11 - 4 = 7$
$15 - 9 = 6$
$13 - 8 = 5$
$11 - 7 = 4$
2. $5 + 6 =$ $14 - 7 =$ $6 + 8 =$
$11 - 8 =$ $2 + 9 =$ $13 - 6 =$
$4 + 8 =$ $16 - 8 =$ $14 - 8 =$
$6 + 6 =$ $3 + 8 =$ $11 - 5 =$
$11 - 3 =$ $12 - 6 =$ $5 + 9 =$
$2 + 4 + 9 =$ $8 + 5 - 3 =$
$11 - 8 =$ $2 + 9 =$ $13 - 6 =$
$4 + 8 =$ $16 - 8 =$ $14 - 8 =$
$6 + 6 =$ $3 + 8 =$ $11 - 5 =$
$11 - 3 =$ $12 - 6 =$ $5 + 9 =$
$2 + 4 + 9 =$ $8 + 5 - 3 =$
答案
1. $5 + 6 = 11$
2. $14 - 7 = 7$
3. $6 + 8 = 14$
4. $11 - 8 = 3$
5. $2 + 9 = 11$
6. $13 - 6 = 7$
7. $4 + 8 = 12$
8. $16 - 8 = 8$
9. $14 - 8 = 6$
10. $6 + 6 = 12$
11. $3 + 8 = 11$
12. $11 - 5 = 6$
13. $11 - 3 = 8$
14. $12 - 6 = 6$
15. $5 + 9 = 14$
16. $2 + 4 + 9 = 15$
17. $8 + 5 - 3 = 10$
2. $14 - 7 = 7$
3. $6 + 8 = 14$
4. $11 - 8 = 3$
5. $2 + 9 = 11$
6. $13 - 6 = 7$
7. $4 + 8 = 12$
8. $16 - 8 = 8$
9. $14 - 8 = 6$
10. $6 + 6 = 12$
11. $3 + 8 = 11$
12. $11 - 5 = 6$
13. $11 - 3 = 8$
14. $12 - 6 = 6$
15. $5 + 9 = 14$
16. $2 + 4 + 9 = 15$
17. $8 + 5 - 3 = 10$
3. 在$◯$里填“$>$”“$<$”或“$=$”。
$12 - 4◯15 - 7$ $6 + 5◯9 + 3$
$4 + 8◯3 + 9$ $15 - 8◯11 - 6$
$12 - 4◯15 - 7$ $6 + 5◯9 + 3$
$4 + 8◯3 + 9$ $15 - 8◯11 - 6$
答案
12-4=8,15-7=8,8=8,所以12-4=15-7;
6+5=11,9+3=12,11<12,所以6+5<9+3;
4+8=12,3+9=12,12=12,所以4+8=3+9;
15-8=7,11-6=5,7>5,所以15-8>11-6。
=;<;=;>
6+5=11,9+3=12,11<12,所以6+5<9+3;
4+8=12,3+9=12,12=12,所以4+8=3+9;
15-8=7,11-6=5,7>5,所以15-8>11-6。
=;<;=;>
4. 在$◯$里填“$+$”或“$-$”。
$8◯6 = 14$ $15◯3 = 12$ $16◯4 = 13◯1$
$12◯5 = 7$ $3◯8 = 11$ $9◯6 = 7◯8$
$8◯6 = 14$ $15◯3 = 12$ $16◯4 = 13◯1$
$12◯5 = 7$ $3◯8 = 11$ $9◯6 = 7◯8$
答案
$8+6 = 14$;
$15 - 3 = 12$;
$16 - 4 = 12$,$13 - 1 = 12$,所以$16 - 4 = 13 - 1$;
$12 - 5 = 7$;
$3 + 8 = 11$;
$9 + 6 = 15$,$7 + 8 = 15$,所以$9 + 6 = 7 + 8$。
故答案为:$+$;$-$;$-$,$-$;$-$;$+$;$+$,$+$。
$15 - 3 = 12$;
$16 - 4 = 12$,$13 - 1 = 12$,所以$16 - 4 = 13 - 1$;
$12 - 5 = 7$;
$3 + 8 = 11$;
$9 + 6 = 15$,$7 + 8 = 15$,所以$9 + 6 = 7 + 8$。
故答案为:$+$;$-$;$-$,$-$;$-$;$+$;$+$,$+$。
5. 小春和小星折
。小春折了$6$条,小星折了$7$条。两人一共折了多少条?
答案
6+7=13(条)
答:两人一共折了13条。
答:两人一共折了13条。
6. 小红有$15$支彩笔,小明有$7$支彩笔。小红送给小明()支后,两人的彩笔就同样多。(先画一画,再填一填。)
答案
4
解析
先画15个○表示小红的彩笔,画7个△表示小明的彩笔。小红比小明多15-7=8支,将多的8支分成同样多的两部分,8可以分成4和4,所以小红送给小明4支后两人同样多。
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