Five tenths of 1.5.6 is (), and 4.2 times 0.3 is ().

2. The product of1.25 and 1.5 is () decimal places, and it keeps one decimal place as ().

3. Fill in ">" in ○. , "<, or" = ".

395×0.26○395 1.83× 1.6○ 1.83 6.5○ 1×6.5

10×3.26○32.6 5.8×0.9○0.9 0.2 1○0.9 1×0.2 1

4. The positions of Liu Qiang and Bing Wang in the classroom can be represented by points (4, 1) and (2, 7).

4 in (4, 1) means the fourth column, 1 means (), and (2, 7) means that Bing Wang is sitting in column () and row ().

5. When calculating 275÷28, the divisor can be regarded as () degree quotient; When calculating 636÷74, you can take the divisor as () trial quotient.

6. How many can I put in brackets?

48×( )