4-2 · 디딤돌 최상위 S
47 problem types · 6 units
1. Fraction Addition and Subtraction
Add per-day work fractions to find combined output 4.NF.B.3 · take
Apply a defined symbol to compute with fractions 4.NF.B.3 · take
Find patterns in mixed-number sequences and sum 4.NF.B.34.OA.C.5 · take
Build largest and smallest mixed numbers from cards 4.NF.B.3 · take
Subtract the overlap when joining fraction lengths 4.NF.B.3 · take
Find a missing side, then sum sides as fractions 4.NF.B.34.MD.A.3 · take
Use submerged and exposed parts to find bar length 4.NF.B.3 · take
Undo a wrong fraction operation to recover the start 4.NF.B.3 · take
2. Triangles
Systematically count all triangles in a composite 4.G.A.2 · take
Use equilateral 60-degree angles and equal sides 4.G.A.24.MD.C.7 · take
Folded angles are equal; chain to the unknown 4.MD.C.7 · take
Chain isosceles base angles to find unknown angles 4.MD.C.74.G.A.2 · take
Two radii form an isosceles triangle; find angles 4.MD.C.74.G.A.2 · take
Spot equal sides to build isosceles triangles 4.MD.C.74.G.A.2 · take
Rotation preserves side lengths and angle measures 4.MD.C.7 · take
3. Decimal Addition and Subtraction
Build the decimal closest to a target from cards 5.NBT.B.74.NF.C.7 · take
Place consecutive whole numbers to sum decimals 5.NBT.B.7 · take
Use weight differences to find the empty container 5.NBT.B.74.MD.A.2 · adapt
Compare the next digit to fill a blank in decimals 4.NF.C.7 · take
Find the extreme decimal satisfying an inequality 5.NBT.B.74.NF.C.7 · take
Reverse decimal operations to recover the start 5.NBT.B.7 · take
Eliminate to find two decimals from sum and difference 5.NBT.B.7 · take
Undo a wrong decimal operation to recover the start 5.NBT.B.7 · take
Perimeter as decimal side sums minus overlaps 5.NBT.B.74.MD.A.3 · adapt
4. Quadrilaterals
Draw an auxiliary parallel line to find a bent angle 4.G.A.1 · adapt
Perimeter of overlapped squares and rectangles 4.MD.A.34.G.A.2 · adapt
Corresponding and alternate angles are equal 4.G.A.1 · adapt
Count all the rhombuses in a figure of small triangles 4.G.A.2 · take
Folding makes congruent corresponding angles 4.G.A.1 · adapt
Adjacent angles of a parallelogram sum to 180 4.G.A.2 · adapt
Perpendicular is half of a straight angle 4.G.A.14.MD.C.7 · take
Distance between parallel sides equals the side length 4.G.A.14.MD.A.3 · adapt
5. Line Graphs
Compare line graphs that use different gridline scales 5.MD.B.2 · adapt
Largest vertical gap between two line graphs 5.MD.B.2 · adapt
Fill a table and complete a line graph from clues 5.MD.B.2 · adapt
Estimate an unmeasured midpoint value on a line graph 5.MD.B.2 · adapt
Read max, min, and gridline scale from a line graph 5.MD.B.23.MD.B.3 · adapt
Sum all data values read from a line graph 5.MD.B.2 · adapt
Slope of a time-distance line graph is speed 4.MD.A.25.MD.B.2 · adapt
6. Polygons
Exterior angle sum of a regular polygon is 360 4.G.A.24.MD.C.7 · adapt
Isosceles triangle from a rectangle diagonal 4.G.A.24.MD.C.7 · adapt
Diagonals of a parallelogram bisect each other 4.G.A.2 · adapt
Polygon angle sum via triangulation from a vertex 4.G.A.2 · adapt
Square diagonals are equal and perpendicular bisectors 4.G.A.24.MD.A.3 · adapt
Count distinct shapes built by adding congruent tiles 4.G.A.2 · take
Identify tiling pieces and total area 4.G.A.24.MD.A.3 · adapt