🔢 Numbers up to 99

What your child will learn

• Students will be able to group objects into tens and ones and state how many tens and ones are in a given number up to 99.
• Students will be able to read and write two-digit numerals and number names from 21 to 99.
• Students will be able to count forward and backward in tens from any multiple of ten up to 90.
• Students will be able to compare two two-digit numbers using tens and ones and use the symbols >, < and =.

Lessons in this unit

1. Tens and ones: Group objects into bundles of ten and leftover ones. Children make bundles of sticks, count tens and ones, and record as '3 tens and 4 ones'.
2. Reading and writing two-digit numbers: Read and write numerals and number names from 21 to 99. Children connect tens and ones to the written form, e.g., 34 is 'thirty-four'.
3. Counting in tens: Count forward and backward in tens from any multiple of ten up to 90. Children use bundles of ten and a number line to see the pattern.
4. Comparing two-digit numbers: Compare two two-digit numbers by looking at tens first, then ones. Children use >, < and = and explain their reasoning.

Key words

tens

Groups of ten things, like ten sticks tied together.

ones

Single things that are not in a group of ten.

two-digit number

A number with two parts: tens and ones, like 34.

compare

Look at two numbers and say which is bigger or smaller.

greater than

Bigger than. The open side of the sign faces the bigger number.

less than

Smaller than. The point of the sign faces the smaller number.

Help your child at home

What to watch for

A bundle of 10 sticks is counted as 1, not 10.

Help: Count the sticks inside the bundle: 1, 2, 3 ... 10. The bundle is ten.

34 is read as 'three four'.

Help: Say the tens digit as 'thirty' (3 tens) and the ones as 'four'. So 34 is 'thirty-four'.

Counting in tens means adding 1 to the tens digit: 30, 40, 50 is wrong because 30+10=40, not 30+1.

Help: When we count in tens, the ones digit stays 0. 30, 40, 50, 60.

The number with the bigger ones digit is bigger: 52 > 47 because 2 > 7? No, 47 < 52 because 4 tens < 5 tens.

Help: Always compare tens first. 4 tens is less than 5 tens, so 47 < 52.

Try this at home

• Bundle 34 sticks: make 3 bundles of 10, 4 sticks are loose → '3 tens and 4 ones'
• Convert tens and ones to numeral
• Count forward in tens from 10
• Compare 47 and 52: look at tens first; 4 tens is less than 5 tens, so 47 < 52.

Quick questions to ask aloud

1. Riya has 2 bundles of 10 sticks and 3 loose sticks. How many tens does she have? (2 / 3 / 23)
   Show answer

   Each bundle is one ten. Riya has 2 bundles, so she has 2 tens.
2. Which number is 'thirty-four'? (34 / 43 / 304)
   Show answer

   Thirty-four has 3 tens and 4 ones. In the T O chart, that is 34.
3. Count in tens: 10, 20, 30, ____
   Show answer

   We add 10 each time. 30 + 10 = 40.

Parent guide: how to help your child with Class 1 Maths

Frequently asked questions

What will my child learn in "Numbers up to 99" (Class 1 Maths)?

Your child will be able to: group objects into tens and ones and state how many tens and ones are in a given number up to 99.; read and write two-digit numerals and number names from 21 to 99.; count forward and backward in tens from any multiple of ten up to 90.; compare two two-digit numbers using tens and ones and use the symbols >, < and =..

How does MangoMindz teach "Numbers up to 99"?

In 4 short parts (Tens and ones, Reading and writing two-digit numbers, Counting in tens, Comparing two-digit numbers). Each part has a picture-based lesson read aloud by Mango Teacher, a quick check, and a quiz built from common mistakes children make, with Mango, a study buddy, for questions.

How long does "Numbers up to 99" take?

About 120 minutes in total, spread over 4 parts of 15–25 minutes each.

How can I help my child with "Numbers up to 99" at home?

Work through a small example together, such as: Bundle 34 sticks: make 3 bundles of 10, 4 sticks are loose → '3 tens and 4 ones'; Convert tens and ones to numeral. Then ask a quick question aloud: Riya has 2 bundles of 10 sticks and 3 loose sticks. How many tens does she have? (2 / 3 / 23)

What mistakes do children often make in "Numbers up to 99"?

A bundle of 10 sticks is counted as 1, not 10. Fix: Count the sticks inside the bundle: 1, 2, 3 ... 10. The bundle is ten. 34 is read as 'three four'. Fix: Say the tens digit as 'thirty' (3 tens) and the ones as 'four'. So 34 is 'thirty-four'. Counting in tens means adding 1 to the tens digit: 30, 40, 50 is wrong because 30+10=40, not 30+1. Fix: When we count in tens, the ones digit stays 0. 30, 40, 50, 60.

Is "Numbers up to 99" free on MangoMindz?

Yes. Every lesson part and quiz in "Numbers up to 99" is free on MangoMindz, with no ads.