1. 看图算一算。
(1)
$10 + 5 = □$
$15 - □ = □$
(2)
$11 + 3 = □$
$□ - □ = □$
(1)
$10 + 5 = □$
$15 - □ = □$
(2)
$11 + 3 = □$
$□ - □ = □$
答案
(1)
$10+5=15$
$15-5=10$
(2)
$11+3=14$
$14-3=11$
$10+5=15$
$15-5=10$
(2)
$11+3=14$
$14-3=11$
2. 数一数,填一填。
(1)
$12 + 5 = □$
(2)
$17 - 2 = □$
(3)

$□ + □ = □$
(4)

$□ - □ = □$
(1)
$12 + 5 = □$
(2)
$17 - 2 = □$
(3)
$□ + □ = □$
(4)
$□ - □ = □$
答案
(1)
$12+5=17$
(2)
$17-2=15$
(3)
$13+4=17$
(4)
$15-2=13$
$12+5=17$
(2)
$17-2=15$
(3)
$13+4=17$
(4)
$15-2=13$
3. 计算。
$19 - 5 =$ $13 + 6 =$ $18 - 7 =$ $18 - 8 =$ $11 + 9 =$
$14 - 4 =$ $16 + 3 =$ $17 - 10 =$ $10 + 5 =$ $15 - 4 =$
$19 - 5 =$ $13 + 6 =$ $18 - 7 =$ $18 - 8 =$ $11 + 9 =$
$14 - 4 =$ $16 + 3 =$ $17 - 10 =$ $10 + 5 =$ $15 - 4 =$
答案
$19 - 5 = 14$
$13 + 6 = 19$
$18 - 7 = 11$
$18 - 8 = 10$
$11 + 9 = 20$
$14 - 4 = 10$
$16 + 3 = 19$
$17 - 10 = 7$
$10 + 5 = 15$
$15 - 4 = 11$
$13 + 6 = 19$
$18 - 7 = 11$
$18 - 8 = 10$
$11 + 9 = 20$
$14 - 4 = 10$
$16 + 3 = 19$
$17 - 10 = 7$
$10 + 5 = 15$
$15 - 4 = 11$
4. 淘气左手拿 12 根小棒,右手拿 18 根小棒,淘气怎么做两只手拿的小棒就一样多了。请画出你的想法。
答案
18-12=6(根)
6=3+3
画图:
左手:○○○○○○○○○○○○
右手:○○○○○○○○○○○○○○○○○○
(从右手圈出3个○,移到左手处)
移动后:
左手:○○○○○○○○○○○○○○○
右手:○○○○○○○○○○○○○○○
答:从右手拿3根小棒放到左手,两只手拿的小棒就一样多了。
6=3+3
画图:
左手:○○○○○○○○○○○○
右手:○○○○○○○○○○○○○○○○○○
(从右手圈出3个○,移到左手处)
移动后:
左手:○○○○○○○○○○○○○○○
右手:○○○○○○○○○○○○○○○
答:从右手拿3根小棒放到左手,两只手拿的小棒就一样多了。
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