Americans are now spending more time alone than ever. It’s changing our personalities, our politics, and even our ...

DON EMMERT/AFP via Getty ImagesThe 1970s introduced a plethora of toys that have evolved from childhood playthings to ...

For example, 320 to 1 significant figure is 300. Using place value labels can help identify what degree of accuracy to round to. Remember: Units are often referred to as ones. Eg, 34 has 3 tens ...