一、选一选。(填序号)
1. 从30数到39,一共数了(
①10
②9
③8
1. 从30数到39,一共数了(
①
)个数。①10
②9
③8
答案
1. ①
2.苹果有68个,梨比苹果多得多,梨可能有(
①98个
②65个
③36个
①
)。①98个
②65个
③36个
答案
2. ①
3.小方已经写了7个大字,再写(
①7
②8
③9
②
)个大字,就够15个了。①7
②8
③9
答案
3. ②
4.小红的前面有8人,后面也有8人,一共有(
①16
②17
③18
②
)人。①16
②17
③18
答案
4. ②
二、计算。
1. 口算。
$20 - 6 =$
$62 - 2 =$
$6 + 30 =$
$13 - 9 =$
$5 + 10 =$
$80 + 8 =$
$74 - 70 =$
$28 - 20 =$
$90 + 7 =$
$69 - 60 =$
$8 + 90 =$
$11 - 3 - 3 =$
$8 + 7 - 9 =$
$19 - 5 + 1 =$
$72 - 2 + 8 =$
$88 - 80 + 7 =$
$4 + 8 + 5 =$
$7 + 9 - 10 =$
$4 + 8 + 6 =$
$40 + 20 + 6 =$
1. 口算。
$20 - 6 =$
$62 - 2 =$
$6 + 30 =$
$13 - 9 =$
$5 + 10 =$
$80 + 8 =$
$74 - 70 =$
$28 - 20 =$
$90 + 7 =$
$69 - 60 =$
$8 + 90 =$
$11 - 3 - 3 =$
$8 + 7 - 9 =$
$19 - 5 + 1 =$
$72 - 2 + 8 =$
$88 - 80 + 7 =$
$4 + 8 + 5 =$
$7 + 9 - 10 =$
$4 + 8 + 6 =$
$40 + 20 + 6 =$
答案
14 60 36 4 15 88 4 8
97 9 98 5 6 15 78 15
17 6 18 66
97 9 98 5 6 15 78 15
17 6 18 66
2. 在□里填上合适的数。
80 + □ = 89
□ + 20 = 21
9 + □ = 15
32 - □ = 2
47 - □ = 40
□ - 8 = 60
□ - 90 = 5
□ - □ = 2
78 = □ + □
8 = □ - □
□ + □ = 42
□ - □ = 10
80 + □ = 89
□ + 20 = 21
9 + □ = 15
32 - □ = 2
47 - □ = 40
□ - 8 = 60
□ - 90 = 5
□ - □ = 2
78 = □ + □
8 = □ - □
□ + □ = 42
□ - □ = 10
答案
9 1 6 30 7 68 95 4 2 70 8
18 10 40 2 14 4(最后十空答案不唯一)
18 10 40 2 14 4(最后十空答案不唯一)
1. 菜地里原来长着67根胡萝卜,小兔子拔了60根,还剩多少根没拔?
$□◯□=□(\quad\quad)$
$□◯□=□(\quad\quad)$
答案
67 - 60 = 7(根)
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