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Is there a mixed operation of oral and written mathematics in the fourth grade of primary school?
200× 30 = 42× 4 = 63× 7 = 230× 20-46 =130× 3 = 60× 50 = 36× 20 = 490 ÷ 70+58 =150 ÷ 3.

827×43 729×86

330÷2 1 108×49

705÷25 1070÷39

850÷39 9 180÷27

300×6= 250÷50= 3×38 470×28 430÷460 19888÷37 15×8+97= 2 10÷30-69=

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