The number $7$7 is plotted on the number line.
Round $7$7 to the nearest $10$10 and plot it on the blank number line.
Round $518$518 to the nearest ten.
Round $253$253 to the nearest hundred.
Is the number $921$921 closer to $900$900 or $1000$1000?
uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers