➖ Subtraction up to 99

What your child will learn

• Students will be able to subtract a 2-digit number from another 2-digit number without borrowing using bundles of tens and ones and the column method.
• Students will be able to subtract a 2-digit number from another 2-digit number with borrowing using bundles of tens and ones and the column method.
• Students will be able to check a subtraction by adding the difference to the number subtracted.
• Students will be able to solve word problems involving subtraction within 99 in daily life contexts.

Lessons in this unit

1. Subtract without borrowing: Subtract 2-digit numbers where each digit in the top number is big enough. Use bundles of tens and ones, then the column method.
2. Subtract with borrowing: Subtract 2-digit numbers when the ones digit of the top number is smaller than the bottom. Use bundles to show exchanging 1 ten for 10 ones, then the column method.
3. Check by adding: Use addition to check subtraction. If a – b = c, then c + b = a. Apply to both with and without borrowing.
4. Word problems: Solve subtraction word problems within 99 in daily life contexts. Identify the operation, write the number sentence, solve, and check. Include both without and with borrowing.

Key words

subtract

Take away. Find how many are left.

minus

The sign – that means take away.

difference

The answer when you subtract. How many more or less.

borrow

Take one ten and break it into ten ones to subtract.

column method

Write numbers one under the other, tens under tens, ones under ones.

check

Add your answer to the number you took away. You should get the first number.

Help your child at home

What to watch for

Subtract the smaller number from the larger number in each column, even if it means swapping digits.

Help: Always subtract the bottom digit from the top digit. If the top is too small, we need to borrow (next lesson).

When the top ones digit is smaller, just subtract the smaller from the larger (swap).

Help: You cannot swap. You must borrow one ten to make more ones.

To check subtraction, subtract the answer from the original number.

Help: Checking means using the opposite operation. Subtraction and addition are opposites.

Words like 'more' always mean addition.

Help: Read the whole story. 'How many more' means compare and subtract.

Try this at home

• Bundles to column: 57 – 23
• Bundles to column: 52 – 27
• Check 57 – 23 = 34 by adding 34 + 23
• Take away: Riya had 60 stickers, gave 25, how many left?

Quick questions to ask aloud

1. What is 57 – 23?
   Show answer

   Subtract ones: 7 – 3 = 4. Subtract tens: 5 – 2 = 3. So 57 – 23 = 34.
2. What is 52 – 27?
   Show answer

   Borrow 1 ten from 5 tens. Now we have 4 tens and 12 ones. 12 – 7 = 5, 4 – 2 = 2. So 25.
3. To check 45 – 18 = 27, what should you add? (27 + 18 / 45 + 27 / 45 + 18)
   Show answer

   27 + 18. Add the answer (27) and the number you subtracted (18). You should get 45.

Parent guide: how to help your child with Class 2 Maths

Frequently asked questions

What will my child learn in "Subtraction up to 99" (Class 2 Maths)?

Your child will be able to: subtract a 2-digit number from another 2-digit number without borrowing using bundles of tens and ones and the column method.; subtract a 2-digit number from another 2-digit number with borrowing using bundles of tens and ones and the column method.; check a subtraction by adding the difference to the number subtracted.; solve word problems involving subtraction within 99 in daily life contexts..

How does MangoMindz teach "Subtraction up to 99"?

In 4 short parts (Subtract without borrowing, Subtract with borrowing, Check by adding, Word problems). 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 "Subtraction 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 "Subtraction up to 99" at home?

Work through a small example together, such as: Bundles to column: 57 – 23; Bundles to column: 52 – 27. Then ask a quick question aloud: What is 57 – 23?

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

Subtract the smaller number from the larger number in each column, even if it means swapping digits. Fix: Always subtract the bottom digit from the top digit. If the top is too small, we need to borrow (next lesson). When the top ones digit is smaller, just subtract the smaller from the larger (swap). Fix: You cannot swap. You must borrow one ten to make more ones. To check subtraction, subtract the answer from the original number. Fix: Checking means using the opposite operation. Subtraction and addition are opposites.

Is "Subtraction up to 99" free on MangoMindz?

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