Louisiana Grade 1 Math

What number belongs in the box?

Consider the original equation 9 + 4 = □ + 5. The equal sign says the two sides must have the same value. Find the missing number and explain how you know, using counters, drawings, or a spoken explanation. An adult can read the equation aloud while the child works with the quantities.

Build the explanation

The left side is nine and four together, which makes thirteen. The right side must also make thirteen. Five counters are already represented there, so eight more are needed. Putting eight in the box gives 8 + 5 = 13. Both sides now have the same value. The missing number is eight, while the total on each side is thirteen. These numbers play different roles. A child can draw thirteen counters for the left side, set aside five on the right, and count the remaining eight to connect the drawing with the equation.

Check a tempting answer

Thirteen does not belong in the box simply because it is the answer to nine plus four. With thirteen in the box, the right side becomes 13 + 5 = 18. Thirteen and eighteen are not equal. The error treats the equal sign as a signal to write an answer next, instead of a relationship between two quantities. Ask the child to evaluate each side with the proposed number. Finding the mismatch is more useful than erasing the answer without explaining it.

Connect the parts with the whole

The equation can also be understood as asking what joins five to make thirteen. That relationship links addition with taking thirteen apart into five and eight. Students do not need a formal algebra procedure to make this explanation. Give time to move objects and say which part the box represents. If a child counts every counter accurately but still puts the total in the box, return to the meaning of the right-hand expression. Accuracy in counting and understanding an equation are related but distinct observations.

Try a related change

Replace five with six: 9 + 4 = □ + 6. The total on the left stays thirteen, so the box becomes seven. Explain why increasing the known part by one decreases the missing part by one. Then test a different total with counters before reducing the support. Use the current Louisiana Grade 1 references to connect this focused task with other addition and subtraction situations. One completed equation is useful evidence about the equal sign, not proof of fluent performance across the whole curriculum.

Selected references from Louisiana mathematics standards

The Louisiana mathematics standards directory lists current and updated standards. For 2026–27, use the current K–12 document, updated December 21, 2017; the revised standards have full implementation in 2027–28. These selected references identify the worked activity’s focus. The expectations include numbered requirements, examples, and mathematical practices. Read the full document and confirm the school’s current instructional sequence.

Sources checked October 6, 2026. Read complete requirements, clarifications, limitations, and mathematical practices alongside the school’s sequence. This selected activity is an entry point for instruction.

Connect the explanation with practice

Visit the Grade 1 math learning Online Center for broader support or choose a related task from the existing Grade 1 worksheet collection. This is a general collection, not a certification of complete Louisiana alignment.

Grade 1 is below Louisiana’s general LEAP mathematics testing range, which begins in Grade 3. Use classroom observations, models, and explanations to plan early learning. Read Louisiana’s assessment overview.

Keep one example of the student’s reasoning with the practice result. Choose a smaller model, a related question, or a new context according to the difficulty revealed in the worked activity.

Louisiana Grade 1 math: useful study questions