1. 直接写出得数。
30 + 70 = 42 + 54 = 40 + 50 = 40 + 80 - 20 =
120 - 50 = 70 - 40 = 30 + 80 = 70 + 60 - 20 =
90 + 10 = 98 - 76 = 40 + 80 = 70 + 70 + 80 =
150 - 60 = 80 + 60 = 110 - 50 = 110 - 20 + 80 =
60 + 60 = 50 + 80 = 180 - 80 = 120 + 40 - 70 =
70 + 70 = 170 - 80 = 82 - 17 = 50 + 80 + 60 =
80 + 80 = 99 - 77 = 66 - 16 = 180 - 80 - 30 =
160 - 90 = 140 - 60 = 44 - 40 = 80 + 80 + 80 =
30 + 70 = 42 + 54 = 40 + 50 = 40 + 80 - 20 =
120 - 50 = 70 - 40 = 30 + 80 = 70 + 60 - 20 =
90 + 10 = 98 - 76 = 40 + 80 = 70 + 70 + 80 =
150 - 60 = 80 + 60 = 110 - 50 = 110 - 20 + 80 =
60 + 60 = 50 + 80 = 180 - 80 = 120 + 40 - 70 =
70 + 70 = 170 - 80 = 82 - 17 = 50 + 80 + 60 =
80 + 80 = 99 - 77 = 66 - 16 = 180 - 80 - 30 =
160 - 90 = 140 - 60 = 44 - 40 = 80 + 80 + 80 =
答案
1. 100 96 90 100 70 30 110 110 100 22 120 220 90 140 60 170 120 130 100 90 140 90 65 190 160 22 50 70 70 80 4 240
2. (
40 +(
12 +(
8 +(
42
)里最大能填几?40 +(
42
)<83 (51
) - 22<30 76 -(5
)>7012 +(
49
)<62 54 -(37
)>16 55 -(34
)>208 +(
31
)<40 43 +(36
)<80 (78
) - 40<39答案
2. 42 51 5 49 37 34 31 36 78
3. 在□里填合适的数。
(1)□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$10
(2)□$\xrightarrow{+7}$□$\xrightarrow{-6}$□$\xrightarrow{+5}$□$\xrightarrow{-4}$□$\xrightarrow{+3}$47
(1)□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$□$\xrightarrow{-9}$10
(2)□$\xrightarrow{+7}$□$\xrightarrow{-6}$□$\xrightarrow{+5}$□$\xrightarrow{-4}$□$\xrightarrow{+3}$47
答案
3. (1)55 46 37 28 19 (2)42 49 43 48 44
按要求把1,2,3,5分别填入□里,写成加法算式。
和最大:□□ + □□ 和最小:□□ + □□
和最大:□□ + □□ 和最小:□□ + □□
答案
52 31(或 51 32) 13 25(或 15 23)
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