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Play select games from the ST Math second grade curriculum. Concepts include place value, number line, comparing numbers, and more.

Model 3-digit numbers using visual place value representations.

- Use a visual base ten model to represent 3-digit numbers with hundreds (bouquets), tens (flowers), and ones (petals).
- Apply the idea that a set of 10-ones or tens makes 1 set of the next higher unit.
- Levels begin by matching the visual model to base-10 numbers (1, 10, 100), then progress to modeling 3-digit numbers with visuals.

Estimate points on number lines up to 100 using benchmarks.

- Develop estimation strategies for finding numbers to 100 using benchmarks.
- Levels begin with number lines to 20, then progress to number lines to 100 with 0, 50, and 100 as benchmarks.
- Feedback allows students to revise their estimates based on initial responses.

Use addition and subtraction strategies to solve 2-step problems.

- Develop strategies for solving multi-step problems using addition and subtraction.
- Find the exact number of pies that the ‘Pie Monsters’ need by adding or subtracting from the given pies on the table.
- Levels begin by feeding 1 monster visual pies, then move to feeding 2 monsters with numbers representing pies.

Develop concepts of measuring length in non-standard and standard units.

- Understand length as distance measured by iterating units without gaps or overlaps.
- Levels begin with non-standard, visual objects placed side-by-side, then progress to using rulers to measure distance.
- Feedback allows students to revise their estimates based on initial responses.

Find unknown numbers for addition or subtraction equations using visual models.

- Fill in the missing number to make an equation true using a visual model for adding or subtracting one- and two-digit numbers.
- Levels begin with finding sums or differences, then move to finding missing addends or subtrahends.
- Equations are posed with operation on either side of the equal sign: 24-3= 21 and 21=24-3.

Compare two whole numbers and find the difference.

- Develop the concept and language for comparing two whole numbers by finding the difference as ’more than’ or ‘less than’.
- Levels begin with visual models with differences of 2 to 4 blocks, then advance to comparing whole numbers: e.g, ‘3 is 2 less than 5’.
- Feedback allows students to understand the language and concept of comparing as addition or subtraction.

Count and match sets of up to 10 objects.

- Develop counting strategies such as 1:1 correspondence and cardinality.
- Levels begin by just clicking on given objects, then progress to selecting equivalent number of squares in the ground.
- As the levels transition, students internalize strategies and connect numerals to the counting sequence.

Develop addition concepts by finding the total number of blocks.

- Add blocks at the start (left side) to the blocks in the middle by selecting the total number of blocks at the end (right side).
- Develop and apply strategies for solving visual addition problems.
- Levels start with sums ≤ 5 by adding up to 2 more blocks and transition to sums up to 10.

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