1. 算一算。
$10 + 6 = $ $12 + 3 = $ $18 - 8 = $ $18 - 10 = $
$7 + 10 = $ $9 + 10 = $ $17 - 2 = $ $17 - 7 = $
$13 + 4 = $ $11 + 8 = $ $16 - 3 = $ $19 - 9 = $
$10 + 6 = $ $12 + 3 = $ $18 - 8 = $ $18 - 10 = $
$7 + 10 = $ $9 + 10 = $ $17 - 2 = $ $17 - 7 = $
$13 + 4 = $ $11 + 8 = $ $16 - 3 = $ $19 - 9 = $
答案:
16 15 10 8 17 19 15 10 17 19 13 10
2. 在$◯$里填上“$>$”“$<$”或“$=$”。
$10 + 2◯10$ $17 - 2◯17$ $8 + 10◯18$
$10 - 2◯10$ $17 + 2◯19$ $15 - 10◯6$
$10 + 2◯10$ $17 - 2◯17$ $8 + 10◯18$
$10 - 2◯10$ $17 + 2◯19$ $15 - 10◯6$
答案:
> < = < = <
3. 看图写算式。
$□ + □ = □$
$□ - □ = □$
$□ + □ = □$
$□ - □ = □$
$□ - □ = □$
$□ - □ = □$
答案:
10 4 14(或 4 10 14)14 10 4(或 14 4 10)10 5 15(或 5 10 15)15 10 5(或 15 5 10)
4. 想一想,算一算。
$□ ◯ □ = □$
(个)
$□ ◯ □ = □$
(盒)
$□ ◯ □ = □$
$□ ◯ □ = □$
答案:
12+4 16 16-5 11
5. 想一想,$\triangle$、$◯$、$□$各表示什么数?
$\triangle + □ = 18$ $9 - □ = 5$ $\triangle + ◯ = 16$
$\triangle = (\quad)$ $◯ = (\quad)$ $□ = (\quad)$
$\triangle + □ = 18$ $9 - □ = 5$ $\triangle + ◯ = 16$
$\triangle = (\quad)$ $◯ = (\quad)$ $□ = (\quad)$
答案:
14 2 4
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