4-1 · 디딤돌 최상위 S
43 problem types · 6 units
1. Large Numbers
Build a number from digit conditions in order 4.NBT.A.2 · adapt
Compare place by place to bound an unknown digit 4.NBT.A.2 · adapt
Find one tick interval, then read the value 4.NBT.A.2 · adapt
Locate and compare numbers on a number line 4.NBT.A.2 · adapt
Ten of a unit carries to the next place 4.NBT.A.14.NBT.A.2 · adapt
Skip-count by the changing place value 4.NBT.A.24.OA.C.5 · adapt
Times ten adds one place 4.NBT.A.1 · adapt
2. Angles
A clock face is twelve equal 30-degree parts 4.MD.C.64.MD.C.7 · adapt
Small angles combine into larger angles 4.MD.C.74.MD.C.5 · take
Use the 180-degree line to find figure angles 4.MD.C.7 · take
Split a polygon into triangles to sum angles 4.MD.C.7 · take
Quadrilateral angles sum to 360 degrees 4.MD.C.7 · take
Set up an equation with one unknown angle 4.MD.C.7 · take
A straight line is 180 degrees 4.MD.C.7 · take
Triangle angles sum to 180 degrees 4.MD.C.7 · take
3. Multiplication and Division
Smaller divisor makes a bigger quotient 4.NBT.B.6 · take
Deduce hidden digits from the ones place up 4.NBT.B.5 · take
A new symbol can define a custom operation 4.OA.A.35.OA.A.1 · take
A number divides by its factor pieces 4.OA.B.44.NBT.B.6 · take
The remainder is always less than the divisor 4.NBT.B.6 · take
How many times the unit quantity 4.OA.A.24.NBT.B.5 · take
Intervals differ on open paths versus closed loops 4.OA.A.34.MD.A.2 · adapt
Bigger units express numbers more simply 4.MD.A.14.MD.A.2 · adapt
Find the value of one unit 4.NBT.B.64.OA.A.2 · adapt
4. Plane Figure Movement
Even number of flips returns original 4.G.A.3 · take
Flip across a line creates symmetry 4.G.A.3 · take
Flipping or turning digits forms new digits 4.G.A.3 · adapt
Four 90-degree turns return original 4.MD.C.5 · take
Reverse the moves to recover original 4.G.A.3 · take
Center of rotation stays fixed 4.MD.C.5 · take
5. Bar Graphs
Read and compare multiple bars 3.MD.B.3 · take
Combine two graphs to find totals 3.MD.B.34.OA.A.3 · adapt
Choose a scale that fits the largest value 3.MD.B.3 · take
Use total and clues to fill missing bars 3.MD.B.34.OA.A.3 · adapt
Convert a table into a bar graph 3.MD.B.3 · adapt
Read a double bar graph 3.MD.B.3 · take
Find the value of one grid square 3.MD.B.3 · take
6. Finding Rules
Sum-and-difference rules in a number grid 4.OA.C.53.OA.D.9 · take
Pair consecutive numbers with constant sum 4.OA.C.53.OA.D.9 · take
Express counts of dots, lines, faces 4.OA.C.5 · take
Use neighbor differences to find rule 4.OA.C.5 · take
Pattern in equations predicts the answer 4.OA.C.53.OA.D.9 · take
Find shape and number rule together 4.OA.C.5 · take