Break the harder factor into two easier ones, multiply each part, then add: 3 × 7 = 3 × 5 + 3 × 2 = 15 + 6 = 21.
commutativeswitching the order: 3 × 2 = 2 × 3
distributivebreak a number apart, multiply each part, add
associativemultiply any two first: (5 × 2) × 5
factora number being multiplied
Watch for: Multiplying only one of the parts after breaking a factor apart. Adding the parts before multiplying them. Changing a number when switching the order.
At home: When a fact like 6 × 8 is hard, ask what they already know that's close: 5 × 8 = 40, then one more 8.
Sample sheet and answer key
Luna's Space Adventure
Grade 3 · Multiplying with properties · 3.OA.B.5
NameDate
Astronaut Luna is exploring a far-off corner of space. Solve each problem to help Luna's mission go smoothly!
New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.