1.C

2.A

3.C

630÷42=630÷7÷6

360÷4÷9=360÷(4×9)

Mathematics clinic

1. Wrong

7500÷25×4

=300×4

= 1200

mistake

2448÷ 12÷2

=2448÷( 12×2)

=2448÷24

= 102