3rd grade Math
14 units matched to the California Content Standards.
Focus areas
- Number and operations: multiplying and dividing within 100, and fractions as numbers
- Measurement, data and geometry: shapes, measuring and reading data
- Mathematical practices: making sense of problems and explaining reasoning
Units
Unit 1
Add & Subtract
Adding and subtracting 2- and 3-digit numbers by place value, number-line jumps and counting up, plus estimating by rounding to the nearest hundred.
Learning standard: 3.NBT.2 · fluently adding and subtracting within 1000
Unit 2
Multiplication
Understanding multiplication as equal groups, arrays, repeated addition and skip counting. Easier sets use 2s, 5s and 10s; stretch sets go beyond 5 × 5.
Learning standard: 3.OA.1; 3.OA.5; 3.OA.7 · multiplication as equal groups, properties of multiplication, and multiplying within 100
Unit 3
Division
Understanding division as sharing fairly and as making equal groups, and using multiplication facts to divide (3 × 4 = 12, so 12 ÷ 3 = 4).
Learning standard: 3.OA.2; 3.OA.6; 3.OA.7 · division as sharing into equal groups and as an unknown factor, and dividing within 100
Unit 4
Fractions
Naming fractions of a shape, a set and a number line, knowing what the top and bottom numbers mean, and comparing fractions by the size of their parts.
Learning standard: 3.NF.1; 3.NF.2; 3.NF.3 · unit fractions, fractions on a number line, and comparing fractions
Unit 5
Patterns & Equations
Extending increasing and decreasing patterns, describing pattern rules in words and tables, and solving one-step equations like ☐ + 8 = 23.
Learning standard: 3.OA.4; 3.OA.9 · finding unknown numbers in equations and explaining arithmetic patterns
Unit 6
Measuring
Measuring with centimeters and meters, grams and kilograms, milliliters and liters: choosing sensible units, estimating, comparing and solving measurement problems.
Learning standard: 3.MD.2 · estimating and measuring liquid volumes and masses
Unit 7
Time
Telling time on an analog clock, working out start and end times, and knowing how seconds, minutes, hours, days, weeks, months and years relate.
Learning standard: 3.MD.1 · telling time to the nearest minute and solving elapsed-time problems
Unit 8
Round & Count
Rounding numbers to the nearest ten or hundred, counting forward and back by 50s, 100s and 200s, and comparing and ordering numbers up to 1000.
Learning standard: 3.NBT.1 · rounding whole numbers within 1000 to the nearest 10 or 100
Unit 9
Area & Perimeter
Finding the perimeter (distance around) of rectangles and triangles, finding a missing side, and measuring area in square centimeters and square meters.
Learning standard: 3.MD.5; 3.MD.6; 3.MD.7; 3.MD.8 · measuring area with unit squares, relating area to multiplication, and solving perimeter problems
Unit 10
Sorting Polygons
Practices naming polygons by their number of sides and sorting them as regular (all sides and angles equal) or irregular.
Learning standard: 3.G.1 · sorting quadrilaterals and other shapes by the attributes they share
Unit 11
Times Tens
Multiplying a one-digit number by a multiple of ten (like 6 × 40) using a basic fact and place value.
Learning standard: 3.NBT.3 · multiplying one-digit whole numbers by multiples of 10 from 10 to 90
Unit 12
Two-Step Stories
Word problems that take two steps with any of the four operations, choosing an equation with a letter for the unknown, and checking an answer by estimating.
Learning standard: 3.OA.8 · solving two-step problems with the four operations and checking answers by estimating
Unit 13
Halves & Fourths of an Inch
Measuring lengths to the nearest half and quarter inch, then reading the measurements from a table like a line plot.
Learning standard: 3.MD.4 · measuring lengths to the nearest half and fourth of an inch and showing the data in a line plot
Unit 14
Scaled Graphs
Reading picture graphs and bar graphs where each picture or step stands for 2, 5 or 10, answering how many more and how many in all, and choosing questions a survey can answer.
Learning standard: 3.MD.3 · drawing and reading scaled picture graphs and bar graphs to answer questions
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