# Adding Using a Hundred Square — Let's Practise

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### TranscriptAdding Using a Hundred Square — Let's Practise

Razzi says get these items ready because today we're going to practise adding using a hundred square. It's time to begin! Remember that a hundred square is organised with numbers one to one hundred in columns and rows. How can you solve eighteen plus five using a hundred square? Start by finding the larger addend, or number. Then, count on the second addend, or number, to find the answer. Did you also get twenty-three? Let's tackle the next problem! Let's solve twenty-four plus six using a hundred square. Start by finding the larger addend, or number, twenty-four. Then, count on the second addend, six, to find the answer. Did you also get thirty? Let's practise another problem! How can you solve thirty-three plus four using a hundred square? Start by finding the larger addend, or number. Then, count on the second addend, or number, to find the answer. Did you also get thirty-seven? Let's tackle the final problem! How can you solve forty-five plus seven using a hundred square? Start by finding the larger addend, or number, forty-five. Then, count on the second addend, or number, to find the answer. Did you also get fifty-two? Razzi had so much fun practising with you today! See you next time!

## Adding Using a Hundred Square — Let's Practise exercise

Would you like to apply the knowledge you’ve learnt? You can review and practice it with the tasks for the video Adding Using a Hundred Square — Let's Practise.
• ### What is 12 + 4?

Hints

Start by identifying the larger addend or number, 12, on the hundred square.

Count on 4 spaces as we are adding 4 to 12.

Solution

• Start by identifying the larger addend or number, 12, on the hundred square.
• Count on by the second addend or number, 4, to find the solution.
12 + 4 = 16

• ### Can you help Razzi work out how many blocks there are?

Hints

Which is the larger addend or number in the addition problem? Locate this on the hundred square.

Which is the smaller addend in the addition problem? Count up by this many from the larger addend.

Remember, when you get to the end of one row, continue counting from the beginning of the next row.

Solution

• Start by identifying the larger addend or number, 18, on the hundred square.
• Count up by the second addend or number, 7, to find the solution.
18 + 7 = 25

• ### Can you use the hundred square to solve the problems?

Hints

Start by identifying the larger addend or number in the problem, then find it on the hundred square.

Count up by the second addend or number to find the solution.

For example, if we were adding 48 + 3, we would find 48 on the hundred square and then count up 3 more.

Solution

22 + 5 = 27

• Start by finding the larger addend or number, 22, on the hundred square.
• Count up by the second addend or number, 5, to find the solution.
37 + 3 = 40
• Start by finding the larger addend or number, 37, on the hundred square.
• Count up by the second addend or number, 3, to find the solution.
56 + 6 = 62
• Start by finding the larger addend or number, 56, on the hundred square.
• Count up by the second addend or number, 6, to find the solution.

Hints

Which is the larger number in the problem? Find it on the hundred square.

How much should you count up by?

For example, if we were adding 88 + 6, we would find 88 on the hundred square and count up 6 more.

Solution

67 + 8 = 75

• Start by finding the larger addend or number, 67, on the hundred square.
• Count up by the second addend or number, 8, to find the solution.
45 + 5 = 50
• Start by finding the larger addend or number, 45, on the hundred square.
• Count up by the second addend or number, 5, to find the solution.
72 + 9 = 81
• Start by finding the larger addend or number, 72, on the hundred square.
• Count up by the second addend or number, 9, to find the solution.

• ### What are the steps for adding using a hundred square?

Hints

Do you identify the larger or smaller addend first?

Which addend do you count up by?

For example, if we were solving 22 + 3, we would find 22 (the larger addend) on the hundred square and then count up by 3 (the smaller addend).

Solution

Steps for adding using a number chart:

• Start by identifying the larger addend in the problem and finding it on the hundred square.
• Finally, find the solution.

• ### Razzi has a two-part problem to solve.

Hints

Start at the larger number and count up by the second number.

Count up by the third number to find the solution.

Solution

27 + 5 + 7 = 39

• Start by finding the larger addend or number, 27, on the hundred square.
• Count up by the second addend or number, 5, to get 32.
• Count up by the third addend or number, 7, to find the solution.