Here are some calculations for you.
Can you figure out the answers in your head?
No calculator allowed.
|3 x 20||900 x 40||60 x 9000|
|6 x 0.7||0.4 x 0.7||0.7 x 0.09|
|24 ÷ 40||40 ÷ 0.5||36 ÷ 0.04|
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