Counting and Understanding Numbers Up to 150 for Class 1

Knowing Numbers up to 150 for Class 1 introduces young learners to the idea that numbers keep growing and that we can read, write, and compare numbers beyond 100. The guide focuses on simple actions like recognising number names and symbols, counting forwards and backwards, grouping tens and ones, and comparing which number is bigger or smaller.

Table of Contents

• Building Numbers Using Blocks up to 99
• Building Numbers Using Blocks up to 150
• Number Names for Class 1
• Comparison of Numbers for Class 1
• Ordering Numbers for Class 1
• Practice Questions for Knowing Numbers up to 150
• Frequently Asked Questions of Knowing Numbers Up to 150 for Class 1

Building Numbers Using Blocks up to 99

In Class 1, numbers are shown using two kinds of blocks: a long rod stands for a ten, which is made up of 10 small cubes and a small cube stands for one. Counting the rods and cubes tells us the number.

Example 1: 3 tens + 2 ones make the number 32.

Example 2: 9 tens + 6 ones make the number 96.

Example 3: When there are tens but no ones like 7 rods and 0 cubes the number is 70, not just 7. The zero in the ones place matters. It tells us there are no loose cubes at all.

Building Numbers Using Blocks up to 150

We keep adding ones and once we reach 10 ones, those 10 ones are regrouped into 1 more ten. And once we have 10 tens together, they are regrouped into 1 hundred.

10 ones = 1 ten, and 10 tens = 1 hundred. 

A hundred is shown using a flat square block made of 100 small cubes.

Example 1: 1 hundred + 2 tens + 5 ones = 125

Example 2: 1 hundred + 5 tens + 0 ones = 150

150 is made of exactly 1 hundred and 5 tens, with no loose cubes left over. So the ones place gets a 0, giving us 150.

Number Names for Class 1

Stage 1: Numbers 1 to 20 (learnt by name, not by rule)

Children simply learn to recognise them by sight and sound, the same way they learn any new word.

Stage 2: Numbers 21 to 99 (tens name + ones name)

From 21 onwards, there's a reliable pattern: say the tens name first, then the ones name.

A hyphen joins the two parts: thirty-four, seventy-seven, eighty-three.

Stage 3: Numbers 100 to 150 (hundred + tens-ones name)

Past 100, we simply say ‘one hundred’ first and then read whatever is left using the same tens-and-ones rule as before.

Comparison of Numbers for Class 1

Comparing means figuring out which of two numbers is bigger, smaller, or if they are equal, using the signs > (greater than), < (less than) and = (equal to).

The Four Rules of Comparing: 

Rule 1: Same number of digits, compare the tens

If both numbers have two digits, look at the tens place first. Whichever has the bigger tens digit is the bigger number.

74 < 86

Since 7 tens is less than 8 tens, 74 < 86.

Rule 2: Different number of digits

A number with more digits is always bigger than a number with fewer digits, no matter what the digits are.

99 < 100

99 is a 2-digit number, 100 is a 3-digit number, so 99 < 100.

Rule 3: Same hundreds digit, compare the tens

If both numbers start with the same hundreds digit, move to the tens place and compare there.

111 < 126

Both start with 1 hundred, but 1 ten is less than 2 tens, so 111 < 126.

Rule 4: Same hundreds and tens, compare the ones

If the hundreds and tens digits are both the same, the number with the bigger ones digit is greater.

119 > 114

Both have 1 hundred and 1 ten, but 9 ones is greater than 4 ones, so 119 > 114.

Ordering Numbers for Class 1

Ordering means arranging a group of numbers from smallest to biggest (ascending order) or biggest to smallest (descending order).

Example 1: Arrange 97, 54, 71 from smallest to biggest

Compare the tens digits: 5, 7, 9. Since 5 < 7 < 9, the order is 54 < 71 < 97.

Example 2: Arrange 137, 131, 132 from biggest to smallest

All three share 1 hundred and 3 tens, so compare the ones digits: 7, 1, 2. That gives 137 > 132 > 131.

Example 3: Arrange 113, 27, 149 from smallest to biggest

27 has only 2 digits while the others have 3, so 27 is automatically the smallest. Between 113 and 149, compare the tens digit: 1 < 4. Final order: 27 < 113 < 149.

Practice Questions for Knowing Numbers Upto 150

1. Write the number for 1 hundred, 4 tens and 3 ones. 

2. Write the number name for 148. 

3. Compare using <, > or =: 150 ___ 15 

4. Compare using <, > or =: 113 ___ 131

5. Arrange 42, 108, 99 from the smallest to the biggest. 

6. Write in hundreds, tens and ones: 137 

7. What number comes right before 110 and right after 110?