2. 判断对错。(对的画 “√”,错的画 “×”)
12+2=14()
3+13=19()
17-1=7()
15-5=10()
10+6=7()
18-10=4()
12+2=14()
3+13=19()
17-1=7()
15-5=10()
10+6=7()
18-10=4()
答案
12+2=14(√)
3+13=19(×)
17-1=7(×)
15-5=10(√)
10+6=7(×)
18-10=4(×)
3+13=19(×)
17-1=7(×)
15-5=10(√)
10+6=7(×)
18-10=4(×)
3.算一算。
$10+5=$
$12-2=$
$17+2=$
$15-4=$
$13+3=$
$18-2=$
$15+4=$
$16-4=$
$10+5=$
$12-2=$
$17+2=$
$15-4=$
$13+3=$
$18-2=$
$15+4=$
$16-4=$
答案
$10+5=15$
$12-2=10$
$17+2=19$
$15-4=11$
$13+3=16$
$18-2=16$
$15+4=19$
$16-4=12$
$12-2=10$
$17+2=19$
$15-4=11$
$13+3=16$
$18-2=16$
$15+4=19$
$16-4=12$
4. 看图写算式。
(1)
$□ + □ = □$
$□ + □ = □$
$□ - □ = □$
$□ - □ = □$
(2)
$□ + □ = □$
$□ + □ = □$
$□ - □ = □$
$□ - □ = □$
(3)
$□ ◯ □ = □$(根)
(4)
$□ ◯ □ = □$(根)
(5)
$□ - □ = □$
(6)
$□ ◯ □ = □$
(1)
$□ + □ = □$
$□ + □ = □$
$□ - □ = □$
$□ - □ = □$
(2)
$□ + □ = □$
$□ + □ = □$
$□ - □ = □$
$□ - □ = □$
(3)
$□ ◯ □ = □$(根)
(4)
$□ ◯ □ = □$(根)
(5)
$□ - □ = □$
(6)
$□ ◯ □ = □$
答案
(1)
$10+7=17$
$7+10=17$
$17-10=7$
$17-7=10$
(2)
$14+4=18$
$4+14=18$
$18-14=4$
$18-4=14$
(3)
$16-6=10$(根)
(4)
$19-10=9$(根)
(5)
$18-5=13$
(6)
$12+3=15$
$10+7=17$
$7+10=17$
$17-10=7$
$17-7=10$
(2)
$14+4=18$
$4+14=18$
$18-14=4$
$18-4=14$
(3)
$16-6=10$(根)
(4)
$19-10=9$(根)
(5)
$18-5=13$
(6)
$12+3=15$
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