Decimal numbers worksheets (with solutions)

Four worksheets on the following: multiplying decimal numbers by positive and negative powers of 10, converting ordinary numbers to standard-form numbers and vice versa, rounding numbers to one or two decimal places and one or two significant figures, multiplying numbers by 25 and 15 and dividing numbers by 25, 20 and 16 mentally. Detailed solutions are included. From https://mathamaniacs.com/