Question

Solve mentally.
a 7 x 40 - 280, so 14 x 20 -
c 9 x 80 = 720, so 18 x 40 -
b 6 x 60 - 360, so 12 x 30 -
d 8 x 60 - 480, so 16 x 30 =​

Answer 1

Answer:

1. 280
2. 720
3. 360
4. 480

Step-by-step explanation:

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