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
Calculate. Choose the correct numbers.
Calculate. Choose the correct numbers.
2
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, that is the next number.
Remember!
If you add 1 to a number, you get the next number.
Next, we think the same way:
if you add 1 to 1 you get 2,
add 1 to 2 you get 3,
add 1 to 3 you get 4,
add 1 to 4 you get 5,
add 1 to 5 you get 6,
add 1 to 6 you get 7,
add 1 to 7 you get 8,
add 1 to 8 you get 9,
add 1 to 9 you get 10.
Remember the results of adding 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, that is the next number.
Remember!
If you add 1 to a number, you get the next number.
Next, we think the same way:
if you add 1 to 1 you get 2,
add 1 to 2 you get 3,
add 1 to 3 you get 4,
add 1 to 4 you get 5,
add 1 to 5 you get 6,
add 1 to 6 you get 7,
add 1 to 7 you get 8,
add 1 to 8 you get 9,
add 1 to 9 you get 10.
Remember the results of adding 1.
3
Calculate using the number line. Choose the correct numbers.
Calculate using the number line. Choose the correct numbers.
4
Fill in the blanks, choose the correct numbers.
Fill in the blanks, choose the correct numbers.
5
Choose the addends. Put the correct numbers.
Choose the addends. Put the correct numbers.
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
Write a short note and solve the problem.
On the first floor of a two-story house there are 4 windows, on the second floor there are 5.
How many windows are there in the house?
Write a short note and solve the problem.
On the first floor of a two-story house there are 4 windows, on the second floor there are 5.
How many windows are there in the house?
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, that is the previous number.
Remember!
If you subtract 1 from a number, you get the previous number.
Next, we think the same way:
if you subtract 1 from 2 you get 1,
subtract 1 from 3 you get 2,
subtract 1 from 4 you get 3,
subtract 1 from 5 you get 4,
subtract 1 from 6 you get 5,
subtract 1 from 7 you get 6,
subtract 1 from 8 you get 7,
subtract 1 from 9 you get 8,
subtract 1 from 10 you get 9.
Remember the results of subtracting 1.
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, that is the previous number.
Remember!
If you subtract 1 from a number, you get the previous number.
Next, we think the same way:
if you subtract 1 from 2 you get 1,
subtract 1 from 3 you get 2,
subtract 1 from 4 you get 3,
subtract 1 from 5 you get 4,
subtract 1 from 6 you get 5,
subtract 1 from 7 you get 6,
subtract 1 from 8 you get 7,
subtract 1 from 9 you get 8,
subtract 1 from 10 you get 9.
Remember the results of subtracting 1.
12
Calculate using the number line. Choose the correct numbers.
Calculate using the number line. Choose the correct numbers.
13
Fill in the blanks, choose the correct numbers.
Fill in the blanks, choose the correct numbers.
14
Choose the minuend.
Put the correct numbers.
Choose the minuend.
Put the correct numbers.
15
Choose the previous number for each number.
Choose the previous number for each number.
16
Choose the minuend.
Put the correct numbers.
Choose the minuend.
Put the correct numbers.
17
Write a short note and solve the problem.
There were 9 frogs sitting on the pond bank.
One frog jumped into the water.
How many frogs are left on the bank?
Write a short note and solve the problem.
There were 9 frogs sitting on the pond bank.
One frog jumped into the water.
How many frogs are left on the bank?
18
Calculate. Choose the correct numbers.
Calculate. Choose the correct numbers.
19
Fill in the blanks. Choose the correct numbers.
Fill in the blanks. Choose the correct numbers.
20
Calculate. Choose the correct numbers.
Calculate. Choose the correct numbers.
