3-2 · 디딤돌 최상위 S
48 problem types · 6 units
1. Multiplication
Set up an expression and compute in order 3.OA.A.33.OA.D.8 · take
Consecutive integers around a middle value 3.OA.D.93.OA.D.8 · take
Place big digits high for largest product 3.OA.C.73.NBT.A.3 · take
Estimate a product to bound an unknown 3.NBT.A.33.OA.C.7 · take
Posts versus gaps on lines and loops 3.OA.A.33.MD.D.8 · adapt
Deduce missing digits in a multiplication 3.OA.C.73.NBT.A.3 · take
Recover the original number from a wrong product 3.OA.A.43.OA.C.7 · take
Sum of evenly spaced numbers equals middle times count 3.OA.D.93.OA.C.7 · take
2. Division
Adjust the total to leave no remainder 3.OA.A.33.OA.C.7 · take
Exact division means remainder zero 3.OA.C.73.OA.B.6 · take
Count posts via length divided by spacing 3.OA.A.33.MD.D.8 · adapt
Fill long-division blanks from the known 3.OA.C.73.OA.B.6 · take
Perimeter as side length times side count 3.MD.D.83.OA.C.7 · adapt
Recover the dividend from quotient and remainder 3.OA.B.63.OA.A.4 · take
Find a rectangle side via one unknown 3.MD.D.83.OA.A.4 · adapt
Remainder must be less than the divisor 3.OA.B.63.OA.C.7 · take
3. Circles
Segment through chained centers as radius multiples 3.OA.C.73.G.A.1 · adapt
Diameter is twice the radius 3.OA.C.73.G.A.1 · adapt
Rectangle sides are multiples of the diameter 3.OA.C.73.G.A.1 · adapt
Center to edge distance is the radius 3.MD.D.83.G.A.1 · adapt
Perimeter splits into radius arcs and straight parts 3.MD.D.83.G.A.1 · adapt
Perimeter of shape joining circle centers 3.MD.D.83.OA.C.7 · adapt
Perimeter of shapes from tangent circles 3.MD.D.83.OA.C.7 · adapt
Find each radius and diameter from segments 3.OA.C.73.G.A.1 · adapt
All radii in one circle are equal 3.MD.D.83.G.A.1 · adapt
Polygon side equals sum of two radii 3.MD.D.83.G.A.1 · adapt
Triangle side equals sum of two radii 3.MD.D.83.G.A.1 · adapt
4. Fractions
Bouncing ball rises a fraction of its fall 3.NF.A.13.OA.A.2 · take
Match fraction forms to compare sizes 3.NF.A.3 · take
Recover the whole from a fractional part 3.NF.A.13.OA.A.4 · take
Fraction of a number: divide then multiply 3.NF.A.13.OA.A.2 · take
Find the rule in a fraction sequence 3.OA.D.93.NF.A.1 · take
Split a whole into proper-fraction portions 3.NF.A.13.OA.A.2 · take
Same numerator: smaller denominator is larger 3.NF.A.3 · take
5. Capacity and Weight
Smaller error means a better weight estimate 3.MD.A.2 · adapt
Find container weight after adding or removing 3.MD.A.2 · adapt
Net fill rate is inflow minus outflow 3.MD.A.23.OA.A.3 · adapt
Round the quotient up to carry the remainder 3.OA.A.33.MD.A.2 · adapt
Set up one-unknown equation for capacities 3.MD.A.23.OA.D.8 · adapt
Add poured water to find total capacity 3.MD.A.2 · adapt
Find the per-unit-weight rate first 3.OA.A.33.MD.A.2 · adapt
Combine sum and difference of two weights 3.MD.A.23.OA.D.8 · adapt
6. Data Organization
Translate between table and pictograph 3.MD.B.3 · take
Solve missing data from ratio or sum clues 3.MD.B.33.NF.A.1 · take
Determine the value each picture symbol stands for 3.MD.B.3 · take
Convert a pictograph into a frequency table 3.MD.B.3 · take
Fill the table by solving knowns first 3.MD.B.33.OA.D.8 · take
Total all categories from a pictograph 3.MD.B.3 · take