Mathematics
Grade 1
15 min
Addition sentences using number lines - sums up to 18
Addition sentences using number lines - sums up to 18
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Identify the starting number in an addition sentence.
Count forward 'hops' on a number line to represent the second number.
Find the sum by looking at the landing point on the number line.
Write a complete addition sentence that matches a number line model.
Draw hops on a number line to solve an addition problem.
Solve addition problems with sums up to 18 using a number line.
Imagine a little frog 🐸 hopping on lily pads! How can we count his hops to find out how far he went?
We will learn to use a number line, which is like a path for numbers. It helps us see how numbers get bigger when we add. This makes adding super easy and fun!
Real-World Applications
Counting steps when you walk down the hall.
Adding more toy cars 🚗 to your collect...
2
Key Concepts & Vocabulary
TermDefinitionExample
Number LineA long line with numbers in order. It's like a ruler for counting! 📏A line showing numbers like 0, 1, 2, 3, 4, 5, 6...
AdditionPutting groups together to find the total. It means 'adding more'.You have 3 apples 🍎🍎🍎 and get 2 more 🍎🍎. You add them together.
Addition SentenceA math sentence that uses numbers and signs to show addition.8 + 4 = 12 is an addition sentence.
Plus Sign (+)This sign tells us to add numbers together. We say 'plus' or 'and'.In 5 + 2, the '+' is the plus sign.
Equals Sign (=)This sign means 'is the same as'. It shows us the answer.In 5 + 2 = 7, the '=' shows that the total is 7.
SumThe answer you get when you add numbers. It's the total amount.In 5 + 2 = 7, th...
3
Core Formulas
The Starting Spot Rule
Start at the first number.
In an addition sentence like 6 + 5, you always find the first number (6) on the number line to begin.
The Hopping Rule
First Number + Hops = Sum
The second number tells you how many hops 🐸 to make. Always hop to the right for addition!
The Landing Spot Rule
a + b = c
The number you land on after all your hops is the sum, or the answer (c).
4 more steps in this tutorial
Sign up free to access the complete tutorial with worked examples and practice.
Sign Up Free to ContinueSample Practice Questions
Challenging
A number line is used to show 6 + 9 = 15. The arrow starts at 15 and makes 9 jumps to the left, landing on 6. What is wrong with this number line for an ADDITION problem?
A.The starting point is wrong.
B.The jumps are going in the wrong direction.
C.The number of jumps is wrong.
D.The landing spot is wrong.
Challenging
A grasshopper starts at 4 on a number line. It makes 3 jumps, then it makes 5 more jumps. What single addition sentence shows its total journey from the start?
A.3 + 5 = 8
B.4 + 3 = 7
C.4 + 5 = 9
D.4 + 8 = 12
Challenging
In a number line that shows the sentence A + B = C, what does the number 'B' represent?
A.The number of jumps.
B.The starting point.
C.The ending point.
D.The longest arrow.
Want to practice and check your answers?
Sign up to access all questions with instant feedback, explanations, and progress tracking.
Start Practicing Free