3rd grade math
Strategies
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 · 3rd grade, 4th grade, 5th gradeIs a square a rectangle? (The shape family tree)
A shape hierarchy is a family tree for shapes. Every shape in a group has all the features of the groups above it. A square has 4 right angles, so it is a re…
Strategy · 3rd grade, 4th grade, 5th gradeWhat is a tape diagram in math?
A tape diagram (also called a bar model) is a rectangle split into equal parts that shows how the numbers in a word problem fit together. For "3/8 of 24 stic…
Strategy · 3rd grade, 4th grade, 5th gradeWhat is the area model for multiplication?
The area model is a way to multiply by drawing a rectangle, splitting each number into tens and ones, and multiplying the smaller pieces. Adding the pieces g…
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
Article · 3rd grade, 4th gradeMultiplying 23 × 14 without "carrying the one"
The area model turns a hard multiplication problem into four easy ones. Here is how it works, why teachers love it, and how it connects to the method you lea…
Article · 2nd grade, 3rd gradeWhy does my kid's subtraction look so different?
Borrowing is now called regrouping, and kids learn it with blocks and number lines before the shortcut. Here is what they are doing and how to help.
