Operations & Word Problems
46 problem types
Multiplication as Equal Groups
Count sticks needed via multiplication Operations
Multiplying by one and by zero Operations
Division as the Inverse of Multiplication
Dividend equals divisor times quotient Operations
Division as repeated subtraction Operations
Find the total first, then divide Operations
Larger dividend gives larger quotient Operations
Multiplicative Comparison and Unit Rate
Find the per-unit-weight rate first OperationsMeasurement & data
Fraction of a number: divide then multiply FractionsOperations
Distance grows in proportion to time Measurement & dataOperations
Find the value of one unit Base-ten numbersOperations
How many times the unit quantity OperationsBase-ten numbers
Speed is distance per unit time Measurement & dataOperations
Slope of a time-distance line graph is speed Measurement & data
Work Backwards to Recover a Start Value
Undo more/less to find original length Measurement & data
Recover the unknown, then recompute Operations
Reverse the operations to find the start Operations
Skip-count backward to the start Base-ten numbers
Reverse decimal operations to recover the start Base-ten numbers
Undo a wrong decimal operation to recover the start Base-ten numbers
Apply a Newly Defined Operation
Evaluate a custom-defined operation symbol Operations
Set up an expression and compute in order Operations
Solve shape-coded products in order Operations
A new symbol can define a custom operation Operations
Find Two Unknowns from Sum and Difference
Find two lengths from sum and difference Measurement & data
Combine sum and difference of two weights Measurement & dataOperations
Find a rectangle side via one unknown Measurement & dataOperations
Reduce to one unknown to solve OperationsBase-ten numbers
Set up one-unknown equation for capacities Measurement & dataOperations
Set up an equation with one unknown angle Measurement & data
Eliminate to find two decimals from sum and difference Base-ten numbers
Track a Quantity Through Changes
Add poured water to find total capacity Measurement & data
Bouncing ball rises a fraction of its fall FractionsOperations
Find container weight after adding or removing Measurement & data
Net fill rate is inflow minus outflow Measurement & dataOperations
Use weight differences to find the empty container Base-ten numbersMeasurement & data
Get Closest to a Target Value
Choose digits for sum nearest a target Base-ten numbersOperations
Smaller error means a better weight estimate Measurement & data
Build the decimal closest to a target from cards Base-ten numbersFractions
Place consecutive whole numbers to sum decimals Base-ten numbers