Georgia 1.NR.5.3

Math1st GradeNumerical Reasoning

The Standard

Add and subtract multiples of 10 within 100.

Georgia's K-12 Mathematics Standards · Use concrete models, the base ten structure, and properties of operations to add and subtract within 100.

Teacher's field guide

What Students Need to Do: Students treat each group of ten as one unit, then combine or remove those units. They show their thinking with ten-rods, bundles, equations, or jumps on a number line.
What Mastery Looks Like: A student quickly finds answers such as 30 + 40 = 70 and 90 − 50 = 40. The student explains that 3 tens plus 4 tens makes 7 tens and checks subtraction by adding.
Common Misconceptions: Students may write 30 + 40 = 34 because they join the nonzero digits. They may write 50 − 20 = 3 because they forget that the digits represent tens. Others use the wrong operation or count individual ones and lose track.
How to Assess It: Exit ticket: Solve 20 + 60 and 90 − 40. For one problem, draw tens or number-line jumps and label the number of tens in the answer.

Lesson moves

Build 70 with seven bundled-straw tens, remove three bundles, then write and read the matching subtraction equation.
Prompt students to compare 30 + 40 with 3 + 4, then draw tens and explain the zero in each answer.
Play Tens Bingo by calling equations such as 80 − 30 while students cover the matching answer on their boards.
Give students a $100 pretend budget and picture cards priced in $10 amounts, then have them choose one item and calculate the money left.

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