3-1 · 디딤돌 최상위 S
51 problem types · 6 units
1. Addition and Subtraction
Bigger addend, bigger sum 3.OA.A.43.NBT.A.2 · take
Choose digits for sum nearest a target 3.NBT.A.23.NBT.A.13.OA.D.8 · take
Sum consecutive numbers via the middle 3.OA.D.93.NBT.A.22.NBT.A.2 · take
Recover hidden digits using regrouping 3.NBT.A.23.OA.A.42.NBT.B.7 · take
One number, many addition expressions 3.NBT.A.23.OA.A.4 · take
Big digits in high places 2.NBT.A.43.NBT.A.2 · take
Overlap shrinks the total length 2.MD.B.53.OA.D.8 · adapt
Ten in a place carries forward 2.NBT.A.13.NBT.A.2 · take
Reduce to one unknown to solve 3.OA.D.83.NBT.A.23.OA.A.4 · take
2. Plane Figures
Count all shapes hidden in a grid 1.G.A.23.OA.D.9 · take
Count segments between points on a line 4.G.A.13.OA.D.9 · take
Base perimeter from multiple views 3.MD.D.8K.G.A.34.MD.A.3 · adapt
Find a side from equal perimeters 3.MD.D.84.MD.A.33.OA.A.4 · adapt
Side lengths from overlapping rectangles 3.MD.D.84.MD.A.33.OA.D.8 · adapt
Perimeter of the nth figure by rule 4.OA.C.53.MD.D.83.OA.D.9 · adapt
Perimeter plus tiles needed to build it 3.MD.D.84.MD.A.33.OA.A.3 · adapt
Perimeter by tracing every side 3.MD.D.84.MD.A.3 · adapt
3. Division
Numbers divisible by several are common multiples 3.OA.B.63.OA.C.7 · take
Dividend equals divisor times quotient 3.OA.B.63.OA.A.4 · take
Division as repeated subtraction 3.OA.A.23.OA.A.3 · take
Narrow candidates by divisibility conditions 3.OA.B.63.OA.C.7 · take
Find the total first, then divide 3.OA.D.83.OA.A.3 · take
Larger dividend gives larger quotient 3.OA.A.23.OA.A.3 · take
Objects versus gaps when spacing along a line 3.OA.A.33.OA.D.8 · adapt
Recover side length from number of cut pieces 3.OA.A.33.MD.D.8 · adapt
4. Multiplication
Place digit cards for largest or smallest product 3.NBT.A.33.OA.B.5 · take
Estimate a product to solve an inequality 3.NBT.A.33.OA.D.8 · take
Evaluate a custom-defined operation symbol 3.OA.D.83.OA.B.5 · take
Recover missing digits from column carries 3.NBT.A.33.OA.B.5 · take
Overlaps are one fewer than the strips 3.MD.D.83.OA.D.8 · adapt
Write a growing pattern as an expression 3.OA.D.93.OA.D.8 · take
Find perimeter path length by multiplication 3.MD.D.83.OA.A.3 · adapt
Find right and wrong counts from total score 3.OA.D.83.OA.A.3 · take
Reduce relations to a single-unknown equation 3.OA.D.83.OA.A.3 · adapt
Reverse the operations to find the start 3.OA.D.83.OA.A.4 · take
5. Length and Time
Sum distances and times across legs 4.MD.A.24.MD.A.13.MD.A.1 · adapt
AM and PM make a 24-hour day 3.MD.A.1 · take
Match units before comparing path lengths 4.MD.A.14.MD.A.22.MD.A.4 · adapt
Distance grows in proportion to time 4.MD.A.23.OA.A.3 · adapt
A drifting clock accumulates daily error 3.MD.A.13.OA.A.3 · take
Total length is the sum of its parts 4.MD.A.14.MD.A.22.MD.B.5 · adapt
Speed is distance per unit time 4.MD.A.23.OA.A.3 · adapt
Time regroups in base sixty 3.MD.A.1 · take
6. Fractions and Decimals
Compare decimals from the highest place down 4.NF.C.7 · take
Compare fractions sharing numerator or denominator 3.NF.A.3 · take
Ten tenths make one whole 4.NF.C.64.NF.C.5 · take
Place big digits high to maximize a decimal 4.NF.C.74.NF.C.6 · take
A fraction is a count of unit fractions 4.NF.B.33.NF.A.1 · adapt
Fractions require equal partitioning of the whole 3.NF.A.13.G.A.2 · take
Find fractions between two on the number line 3.NF.A.23.NF.A.3 · take
The whole is one; find the remaining fraction 3.NF.A.13.NF.A.3 · take