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O.1 Addition and subtraction up to 10: word problems

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Understanding Addition and Subtraction in Stories

Word problems tell a short story about adding or taking away objects. Students learn to listen for clues that signal whether to combine numbers (addition) or remove numbers (subtraction) to find the answer.

Example Problems:
  • There are 3 apples. You get 2 more. How many apples in all? Answer: 5
  • There are 6 balloons. 4 balloons fly away. How many are left? Answer: 2
  • You see 5 ducks. 1 more duck joins them. How many ducks now? Answer: 6
Teacher Tip

Encourage students to identify the action in the story firstโ€”โ€œput togetherโ€ or โ€œtake awayโ€โ€”before solving. This helps them choose the correct operation.

Using Pictures and Objects to Solve Problems

Drawing pictures or using counters helps make the story problem easier to understand. Students can see the action happen and count what is left or combined to find the answer.

Hands-On Examples:
  • You have 4 toy cars. You get 3 more. Draw or use 4 counters, add 3, and count them: Answer is 7.
  • There are 8 flowers. 5 are picked. Remove 5 counters from 8. Count what remains: Answer is 3.
  • There are 2 cookies. You add 4 more. Count all together: Answer is 6.
Helpful Strategy

Have students act out problems using real objects or drawings to connect the numbers to real-life actions.

Counting Strategies for Quick Solving

Counting forward helps with addition, and counting backward helps with subtraction. This skill becomes faster with practice and can be done using fingers or a number line.

Counting Examples:
  • Start at 5, count forward 3 steps: 6, 7, 8 โ†’ Answer is 8.
  • Start at 9, count backward 4 steps: 8, 7, 6, 5 โ†’ Answer is 5.
  • 3 plus how many makes 7? Count up from 3 to 7: 4, 5, 6, 7 โ†’ Answer is 4.
Instructional Tip

Use a large class number line and have students physically hop forward or backward to show their counting steps.

Solving Problems with the Missing Number in Any Position

The missing number can be the first number, the second number, or the result. Understanding this helps students solve more flexible and challenging problems.

Examples:
  • [] + 6 = 9 โ†’ Missing number is 3.
  • 7 โˆ’ [] = 5 โ†’ Missing number is 2.
  • 4 + 3 = [] โ†’ Missing number is 7.
Math Language

Have students restate the number sentence in their own words to reinforce both math vocabulary and comprehension.

Checking the Work

Always check the answer by placing it back into the problem to see if it works. This helps students catch mistakes and understand the relationship between numbers.

Checking Examples:
  • [] + 2 = 6 โ†’ Try 4: 4 + 2 = 6 โœ“
  • 8 โˆ’ [] = 3 โ†’ Try 5: 8 โˆ’ 5 = 3 โœ“
  • 5 + 5 = [] โ†’ Try 10: 5 + 5 = 10 โœ“
Helpful Tip

Model how to re-read the problem after solving and check with the original numbers to confirm the solution.

Making Math Connections to Everyday Life

Relating problems to familiar activities helps students remember what they learn. Everyday experiences, like sharing snacks or playing games, can become simple addition or subtraction problems.

Real-Life Examples:
  • You have 5 pencils. You find 3 more. 5 + 3 = 8.
  • You have 7 cookies. You eat 2. 7 โˆ’ 2 = 5.
  • You have 4 marbles. A friend gives you 4 more. 4 + 4 = 8.
Engagement Tip

Encourage students to create their own word problems from daily activities to make math more meaningful and fun.