Grade 1 Lesson plan
Twenty Counts at the Cranesbill Lane School Sinks
A 35-minute grade 1 health lesson on scrubbing for a count of 20, shutting the tap off while soaping, and solving handwashing problems within 20.
Common Core Math · Grade 1
1.OA.C.6 Add and subtract fluently within 20
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten; decomposing a number leading to a ten; using the relationship between addition and subtraction; and creating equivalent but easier or known sums.
Why water teaches this standard well
Students build fluency by mentally combining or splitting small numbers of water bottles handed out at a school filling station, using making-ten strategies with bottle counts like 8 and 6. Fast, confident mental math with these small totals prepares students for the larger sums they will add once amounts grow past 20.
Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.
7 materials aligned to 1.OA.C.6
Lesson plans
Grade 1 Lesson plan
Willow Bend Creek Cleanup: A Grade 1 Add-and-Subtract Fluency Lesson
A 35-minute grade 1 lesson where students build addition and subtraction fluency within 20 by combining and counting paper litter pieces from a pretend creek cleanup.
Worksheets
Grade 1 Worksheet
Skinny Pipe or Wide Pipe on Ironhill Lane: A Grade 1 Worksheet
Room 5 poured water through a skinny straw and a wide straw for the same count, then used the cup totals to explain why pipe width changes the flow.
Grade 1 Worksheet
Pennywhistle Lane's Watering Cans: A Grade 1 Make-Ten Worksheet
Thirteen grade 1 fluency items within 20 set at a shared garden tap, where students add and subtract watering cans by making a ten.
Grade 1 Worksheet
Keep Copper Creek Clean: A Grade 1 Litter Sort Worksheet
A grade 1 worksheet where students sort natural items from litter found near a creek, count each group, and solve addition and subtraction problems.
Math problem sets
Grade 1 Math problem set
Quail Ridge's Rainy Week: A Grade 1 Measuring Problem Set
A grade 1 math problem set where students add and compare a week of rain-gauge readings measured in same-size cubes, a non-standard unit.
Classroom activities
Grade 1 Classroom activity
Pipers Green's Hydrant Hunt: A Grade 1 Make-Ten Station Game
A 30-minute grade 1 station game where pairs travel to five paper fire hydrants posted around the room and solve a make-ten fact at each one.