Theme Tasks catalog
Adding and subtracting the number 1
• You will learn how to add and subtract the number 1 using a number line;
• You will practice calculating expressions with adding and subtracting 1 and 0;
• You will find the previous and next number for numbers from 1 to 10;
• You will learn to write a short note and solve problems to find the sum and the difference.
• You will practice calculating expressions with adding and subtracting 1 and 0;
• You will find the previous and next number for numbers from 1 to 10;
• You will learn to write a short note and solve problems to find the sum and the difference.
1
Let's see how to add 1 using a number line.
For example, to add 1 to 2,
you need to make 1 step to the right from 2 on the number line.
You get 3 – the next number after 2.
Remember!
If you add 1 to a number, you get the next number.
Look how it works with other numbers:
add 1 to one and you get 2.
add 1 to two and you get 3.
add 1 to three and you get 4,
add 1 to four and you get 5,
add 1 to five and you get 6,
add 1 to six and you get 7,
add 1 to seven and you get 8,
add 1 to eight and you get 9,
add 1 to nine and you get 10.
So, every time we add 1, we get the next number.
Let's see how to add 1 using a number line.
For example, to add 1 to 2,
you need to make 1 step to the right from 2 on the number line.
You get 3 – the next number after 2.
Remember!
If you add 1 to a number, you get the next number.
Look how it works with other numbers:
add 1 to one and you get 2.
add 1 to two and you get 3.
add 1 to three and you get 4,
add 1 to four and you get 5,
add 1 to five and you get 6,
add 1 to six and you get 7,
add 1 to seven and you get 8,
add 1 to eight and you get 9,
add 1 to nine and you get 10.
So, every time we add 1, we get the next number.
2
Use the number lines.
Drag the correct numbers to complete the equations.
Use the number lines.
Drag the correct numbers to complete the equations.
3
Calculate. Choose the correct numbers.
Calculate. Choose the correct numbers.
4
Add the parts to find the whole.
Drag the correct numbers.
Add the parts to find the whole.
Drag the correct numbers.
5
Find the missing part. Drag the correct answers.
Find the missing part. Drag the correct answers.
6
Choose the next number for each number.
Choose the next number for each number.
7
Fill in the blanks, choose the correct numbers.
Fill in the blanks, choose the correct numbers.
8
Choose the addends. Put the correct numbers.
Choose the addends. Put the correct numbers.
9
Listen to the story Problem.
A house has 4 windows downstairs and 5 windows upstairs.
How many windows are there altogether?
Complete the number bond. Drag the numbers from the story.
Listen to the story Problem.
A house has 4 windows downstairs and 5 windows upstairs.
How many windows are there altogether?
Complete the number bond. Drag the numbers from the story.
10
Calculate. Choose the correct numbers.
Calculate. Choose the correct numbers.
11
Let's see how to subtract 1 using a number line.
For example, to subtract 1 from 3,
you need to make 1 step to the left from 3 on the number line.
You get 2. This is the previous number.
Remember!
When you subtract 1 from a number, you get the previous number.
Look how it works with other numbers:
2 minus 1 is 1;
3 minus 1 is 2;
4 minus 1 is 3;
5 minus 1 is 4;
6 minus 1 is 5;
7 minus 1 is 6;
8 minus 1 is 7;
9 minus 1 is 8;
10 minus 1 is 9.
So, every time we subtract 1, we get the previous number.
Let's see how to subtract 1 using a number line.
For example, to subtract 1 from 3,
you need to make 1 step to the left from 3 on the number line.
You get 2. This is the previous number.
Remember!
When you subtract 1 from a number, you get the previous number.
Look how it works with other numbers:
2 minus 1 is 1;
3 minus 1 is 2;
4 minus 1 is 3;
5 minus 1 is 4;
6 minus 1 is 5;
7 minus 1 is 6;
8 minus 1 is 7;
9 minus 1 is 8;
10 minus 1 is 9.
So, every time we subtract 1, we get the previous number.
12
Use the number lines.
Drag the correct numbers to complete the equations.
Use the number lines.
Drag the correct numbers to complete the equations.
13
Subtract to find the missing part.
Drag the correct numbers.
Subtract to find the missing part.
Drag the correct numbers.
14
Complete the equations. Drag the correct numbers.
Complete the equations. Drag the correct numbers.
15
Drag the number that comes before each number.
Drag the number that comes before each number.
16
Choose the minuend.
Put the correct numbers.
Choose the minuend.
Put the correct numbers.
17
Calculate. Choose the right numbers.
Calculate. Choose the right numbers.
18
Listen to the story Problem.
There are 9 frogs on a log. 1 frog jumps into the water.
How many frogs are left on the log?
Complete the number bond. Drag the numbers from the story.
Listen to the story Problem.
There are 9 frogs on a log. 1 frog jumps into the water.
How many frogs are left on the log?
Complete the number bond. Drag the numbers from the story.
19
Fill in the blanks. Choose the correct numbers.
Fill in the blanks. Choose the correct numbers.
20
Calculate. Choose the right numbers.
Calculate. Choose the right numbers.
