Add up to four two-digit numbers using place-value strategies and friendly grouping to make tens; apply properties of operations, check reasonableness, and show precise models.

Add and subtract within 100 using place value, properties, and inverse relationships; choose efficient strategies like make-a-ten or compensation and explain why they work.

Solve within-100 length word problems by modeling equal-unit jumps on a number line; label endpoints, write matching equations with unknowns, and explain how much longer or shorter with units.

Measure lengths in inches and centimeters with correct tool use and zero alignment; estimate using 1 in/1 cm benchmarks, then compare objects to find how much longer or shorter in standard units.

Skip-count within 1,000 from any start by 5s, 10s, and 100s using hundreds-chart and number-line structure; connect patterns to nickels, dimes, and 5-minute time intervals.

Use bundles of tens/hundreds to read–write numbers to 1,000 in standard, word, and expanded form, then compare three-digit numbers with >, =, < using place-value reasoning.

Build, label, and count rectangular arrays up to 5×5; write matching repeated-addition equations with equal addends, use skip-counting for efficiency, and preview area with tiles.

Even/odd foundations for Grade 2—students model numbers to 20 with pairs, arrays, and ten-frames, write even numbers as doubles (equal addends), and justify claims with simple “because” proofs to build algebraic reasoning.

Model and solve addition and subtraction word problems within 100—unknowns in all positions—using drawings, tape diagrams, and equations; students explain reasoning, choose operations that fit the story, and check answers for sense and accuracy.

Build addition/subtraction fluency within 20 through make-10, doubles/near-doubles, count on/back, and compensation; students model thinking, choose efficient strategies, and check with inverse or number lines for accurate, confident recall.

Launch math discourse, build tens/ones language, and practice measurement tool use; students solve number puzzles, explain strategies, check work, and use rulers with precision.