Theme Tasks catalog
Adding a round number to a two-digit number (45 + 20). Subtracting a round number from a two-digit number (45 – 20)
• you will learn how to add and subtract round numbers up to 100;
• you will find out how many tens and ones are in a two-digit number;
• you will improve your skills in adding and subtracting numbers up to 100;
• you will solve problems to find the unknown minuend, to increase and decrease a number by a few units;
• you will practice comparing named numbers written in kilograms.
• you will find out how many tens and ones are in a two-digit number;
• you will improve your skills in adding and subtracting numbers up to 100;
• you will solve problems to find the unknown minuend, to increase and decrease a number by a few units;
• you will practice comparing named numbers written in kilograms.
1
Choose the neighbor numbers.
Choose the neighbor numbers.
2
Count. Give the right balloons to the sportsmen.
Count. Give the right balloons to the sportsmen.
3
Find the number of tens and ones. Choose the right numbers.
Find the number of tens and ones. Choose the right numbers.
4
Make a short note and solve the problem.
There are 16 students in the ninth class,
and in the tenth class there are 5 students less.
How many students are in the tenth class?
Make a short note and solve the problem.
There are 16 students in the ninth class,
and in the tenth class there are 5 students less.
How many students are in the tenth class?
5
Count. Choose the right numbers.
Count. Choose the right numbers.
6
Put the sign greater, less or equal.
Put the sign greater, less or equal.
7
Count. Choose the right numbers.
Count. Choose the right numbers.
8
Find the missing numbers.
Find the missing numbers.
9
Count. Choose the right numbers.
Count. Choose the right numbers.
10
Make a short note and solve the problem.
There were many snails on the meadow.
After six snails hid under the leaves, there were seventeen left.
How many snails were on the meadow at first?
Make a short note and solve the problem.
There were many snails on the meadow.
After six snails hid under the leaves, there were seventeen left.
How many snails were on the meadow at first?
11
Count. Choose the right numbers.
Count. Choose the right numbers.
12
Choose the numbers they make.
Choose the numbers they make.
13
How to add 30 to 64?
Let's split the number 64 into tens and ones.
64 is 6 tens and 4 ones.
60 plus 4.
Add 3 tens to 6 tens.
We get 9 tens.
This is number 90.
90 plus 4 equals 94.
Let's do the task together.
Let's count the expression and choose the right number.
Look at the screen.
We need to count the expression 45 plus 20.
Let's split the number 45 into tens and ones.
Number 45 is 4 tens and 5 ones.
Add 2 tens to 4 tens.
We get 6 tens.
This is number 60.
Add 5 to 60.
We get 65.
So, 60 plus 5 equals 65.
Drag the right number into the empty cell.
Do the next tasks by yourself.
How to add 30 to 64?
Let's split the number 64 into tens and ones.
64 is 6 tens and 4 ones.
60 plus 4.
Add 3 tens to 6 tens.
We get 9 tens.
This is number 90.
90 plus 4 equals 94.
Let's do the task together.
Let's count the expression and choose the right number.
Look at the screen.
We need to count the expression 45 plus 20.
Let's split the number 45 into tens and ones.
Number 45 is 4 tens and 5 ones.
Add 2 tens to 4 tens.
We get 6 tens.
This is number 60.
Add 5 to 60.
We get 65.
So, 60 plus 5 equals 65.
Drag the right number into the empty cell.
Do the next tasks by yourself.
14
Count. Choose the right numbers.
Count. Choose the right numbers.
15
Make a short note and solve the problem.
Make a short note and solve the problem.
16
How to subtract 40 from 75?
Let's split the number 75 into tens and ones.
75 is 7 tens and 5 ones.
70 plus 5.
Take away 4 tens from 7 tens.
We get 3 tens.
This is number 30.
30 plus 5 equals 35.
Let's do the task together.
Let's count the expression and choose the right number.
Look at the screen.
We need to count the expression 97-30.
Let's split the number 97 into tens and ones.
Number 97 is 9 tens and 7 ones.
Take away 3 tens from 9 tens.
We get 6 tens.
This is number 60.
Add 7 to 60.
We get 67.
So, 97-30 equals 67.
Drag the right number into the empty cell.
Do the next tasks by yourself.
How to subtract 40 from 75?
Let's split the number 75 into tens and ones.
75 is 7 tens and 5 ones.
70 plus 5.
Take away 4 tens from 7 tens.
We get 3 tens.
This is number 30.
30 plus 5 equals 35.
Let's do the task together.
Let's count the expression and choose the right number.
Look at the screen.
We need to count the expression 97-30.
Let's split the number 97 into tens and ones.
Number 97 is 9 tens and 7 ones.
Take away 3 tens from 9 tens.
We get 6 tens.
This is number 60.
Add 7 to 60.
We get 67.
So, 97-30 equals 67.
Drag the right number into the empty cell.
Do the next tasks by yourself.
17
Count. Choose the right numbers.
Count. Choose the right numbers.
