一、口算。
$320 + 40 = $
$880÷20 = $
$4900÷700 = $
$4800÷600 = $
$4×600 = $
$400 + 60 = $
$2400÷80 = $
$40×21 = $
$340÷17 = $
$450÷50 = $
$320 + 40 = $
360
$60×7 = $420
$210÷10 = $21
$880÷20 = $
44
$3200÷400 = $8
$350 - 70 = $280
$4900÷700 = $
7
$450÷30 = $15
$3600÷400 = $9
$4800÷600 = $
8
$560 + 70 = $630
$120×3 = $360
$4×600 = $
2400
$108×4 = $432
$420÷60 = $7
$400 + 60 = $
460
$2700÷300 = $9
$650÷50 = $13
$2400÷80 = $
30
$42 + 68 = $110
$73 - 37 = $36
$40×21 = $
840
$2100÷70 = $30
$600÷200 = $3
$340÷17 = $
20
$35 - 17 = $18
$60×19 = $1140
$450÷50 = $
9
$200×5 = $1000
$182 + 28 = $210
答案
360 420 21
44 8 280
7 15 9
8 630 360
2400 432 7
460 9 13
30 110 36
840 30 3
20 18 1140
9 1000 210
44 8 280
7 15 9
8 630 360
2400 432 7
460 9 13
30 110 36
840 30 3
20 18 1140
9 1000 210
二、根据$360÷40 = 9$,在$□$里填合适的数。
$(360÷20)÷(40÷$
$(360×$
$(360×$
$(360÷10)÷(40÷10) = $
$(360÷$
$(360÷20)÷(40÷$
20
$) = 9$ $(360×15)÷(40×$15
$) = 9$$(360×$
23
$)÷(40×23) = 9$ $(360÷$4
$)÷(40÷4) = 9$$(360×$
12
$)÷(40×12) = 9$ $(360÷5)÷(40÷$5
$) = 9$$(360÷10)÷(40÷10) = $
9
$(360×5)÷(40×5) = $9
$(360÷$
40
$)÷(40÷$40
$) = 9$ $(360×$20
$)÷(40×$20
$) = 9$答案
20 15
23 4
12 5
9 9
40 40 20 20
(最后4空答案不唯一)
23 4
12 5
9 9
40 40 20 20
(最后4空答案不唯一)
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