Place value
Ones, tens, hundreds, and why the 4 in 42 means forty.
Strategies
Strategy · 4th grade, 5th gradeWhy does the decimal point "move" when you multiply by 10?
When you multiply by 10, every digit moves one place to the left on a place value chart, because each place is worth 10 times the place to its right. Dividin…
Strategy · 3rd grade, 4th grade, 5th gradeHow do kids round decimals with a number line?
To round on a number line, kids write the two "neighbor" numbers the number sits between, mark the halfway point, and see which neighbor it is closer to. 3.4…
Strategy · 1st grade, 2nd grade, 3rd gradeWhat is an open number line?
An open number line is a blank line your kid draws to add or subtract by making "jumps". Instead of stacking numbers, they hop from one number to the next in…
Articles
Worksheets
Worksheet · 5th gradePowers of 10 and place value
Multiply and divide by 10, 100, and 1,000, use exponents, write decimals in expanded form, and compare decimals.
Worksheet · 5th gradeRounding decimals on a number line
Eight rounding problems with a number line for each, to the nearest whole number, tenth, and hundredth.