30×3+1×3=?×3;50×5+6×5=?×5;100×7+10×7+3×7=???×?;90×6+2×6=??×?

Question

30×3+1×3=?×3;50×5+6×5=?×5;100×7+10×7+3×7=???×?;90×6+2×6=??×?

Answer 1

30*3+1*3=?*3
90+3 =?*3
?=93:3
?=31


50×5+6×5=?×5;
250+30=?*5
?=280:5
?=56


100×7+10×7+3×7=???×?;
700+70+21= ???*?
791=???*?
791= 113*7

90×6+2×6=??×?
540+12=??*?
552= 69*8