Question

口算

150×6=	970+300=	1 9 + 4 9 =	59×9≈	100×0=
503-497=	3 5 - 2 5 =	42+68=	7×13=	220-202=
1 2 + 1 2 =	100-21=	1- 5 7 + 2 7 =	478+360-78=	6×6÷4×9=

Answer 1

150×6=900	970+300=1270	1 9 + 4 9 = 5 9	59×9≈540	100×0=0
503-497=6	3 5 - 2 5 = 1 5	42+68=110	7×13=91	220-202=18
1 2 + 1 2 =1	100-21=79	1- 5 7 + 2 7 = 4 7	478+360-78=760	6×6÷4×9=81