Math problem set Grade 1 Math

Room 4's Reusable Bottle Count at Hazel Grove: A Problem Set

A grade 1 math problem set where students add and subtract a classroom's daily water-bottle refill counts to find weekly totals and comparisons.

Grade: Grade 1
Subject: Math
Material: Math problem set
Time: 30 min
Prep: No prep
Materials: None

Standards

1.OA.A.1 Common Core Math

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

How this material aligns: Problems 1, 5, and 6 use adding-to and comparing word problems with the unknown in different positions, built from Room 4's daily refill-station counts, matching this standard's full range of problem types.

All materials for 1.OA.A.1 →

1.NBT.C.4 Common Core Math

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

How this material aligns: Problems 3 and 4 add a two-digit running total to a one-digit daily count using place-value reasoning, the exact skill this standard describes for adding within 100.

All materials for 1.NBT.C.4 →

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This material is in the public domain (CC0) and may be copied, edited, and shared freely, without attribution. Updated 2026-07-16.

Objectives

Students will add daily refill counts to find a running total for the week.
Students will solve a how-many-more comparison problem using two daily counts.
Students will add a two-digit number and a one-digit number using place-value thinking.

Vocabulary

Key words: refill, total, compare

Teacher overview

Room 4, a fictional first-grade classroom at Hazel Grove Elementary, got a new water refill station this month. Every time a student fills a reusable bottle there, the class adds a sticker to a chart. This problem set follows one week of stickers on Room 4's chart, building a running total day by day. A common misconception in this math is treating a how-many-more question, like problem 5, the same as an addition question, when it actually calls for subtraction to find the difference between two counts.

Room 4's Reusable Bottle Count at Hazel Grove: A Problem Set — Grade 1 Math

Name: ____________________________ Date: ______________

Problems

Room 4 had 8 fills on Monday. It had 6 fills on Tuesday. How many fills in all?
Room 4 had 14 fills so far. Then 5 more fills happened on Wednesday. How many fills now?
Room 4 had 19 fills so far. Then 9 more fills happened on Thursday. How many fills now?
Room 4 had 28 fills so far. Then 7 more fills happened on Friday. How many fills for the week?
Monday had 8 fills. Wednesday had 5 fills. How many more fills were on Monday?
The jug holds 20 fills. So far, 14 fills have happened. How many more fills can the jug hold?
Add 8, 6, 5, 9, and 7. What is the sum of all five days?
The week had 35 fills. Then 3 more fills happened on Saturday. How many fills in all?

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key

Answer: 14 fills. 8 + 6 = 14.
Answer: 19 fills. 14 + 5 = 19.
Answer: 28 fills. 19 + 9 = 28, adding the two-digit total to Thursday's one-digit count.
Answer: 35 fills. 28 + 7 = 35, the total for Monday through Friday.
Answer: 3 more fills. 8 − 5 = 3.
Answer: 6 fills. 20 − 14 = 6.
Answer: 35 fills. 8 + 6 = 14, 14 + 5 = 19, 19 + 9 = 28, 28 + 7 = 35, matching the running total from problem 4.
Answer: 38 fills. 35 + 3 = 38.

Differentiation

Support

Provide a printed running-total chart with Monday's 8, Tuesday's 6, and their sum of 14 already filled in, so students start problem 1 by checking the given sum rather than computing it cold, and allow counters for every problem.

Extension

Ask students to find how many more fills would be needed to reach 50 for the week, starting from the week's actual total of 35 in problem 7, and explain their strategy.

ELL supports

Pre-teach "refill," "total," and "compare" with a simple demonstration: pretend-fill two cups, count them together, then say "total" while pointing to both cups combined. Allow students to show their work with drawings of stickers instead of number sentences.

Extensions

Set up a real sticker chart in the classroom for one week, tracking how many times students actually refill a water bottle at a real station or fountain. Compare the class's real daily counts to Room 4's counts in this problem set, and ask students whether their own class's weekly total is higher, lower, or close to the 35 fills used here.