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Count in 25s | Year 5 Mathematics PDF Download

How do you count in 25s?

  • There are two 25s in 50 and four 25s in 100.
  • Remembering this is very useful when counting in increments of 25.
  • Consider this number line:
    Count in 25s | Year 5 Mathematics
  • Every 25-step corresponds to a larger 50-step. Within each hundred, there are four 25-steps.
  • Multiples of 25 end in 25, 50, 75, or 00.
  • Counting up in increments of 25 always follows this sequence.

Examples

Example 1: What are the missing numbers in this sequence?
225 → ? → 275 → 300 → ?
Sol: 
When counting in increments of 25, the sequence always follows: 25, 50, 75, 00.
Thus, the missing numbers are:
225 → 250 → 275 → 300 → 325

Example 2: Wigglesworth Academy has 25 children in each class. How many children are in 7 classes?
Sol: 
A number line could help you solve this.
Count in 25s | Year 5 Mathematics

The number line shows that 7 steps of 25 is 175. You could also write this as 7 lots of 25.
As a multiplication, that would be:
25 x 7 = 175
There are 175 children in 7 classes of 25 children.

Example 3: Which number in this sequence is the odd one out?
450 → 475 → 490 → 525 → 550
Sol: 
Remember these guidelines for counting in 25s:

  • The sequence always follows the same order.
  • The tens and ones digits are always either 25, 50, 75, or 00.

Now, identify the number that stands out:
It’s 490!
Its tens and ones digits are not 25, 50, 75, or 00, breaking the pattern of counting in 25s.
The next number in the sequence after 475 should be 500:
450 → 475 → 500 → 525 → 550

The document Count in 25s | Year 5 Mathematics is a part of the Year 5 Course Year 5 Mathematics.
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FAQs on Count in 25s - Year 5 Mathematics

1. How can I count in 25s?
Ans. To count in 25s, simply start at 25 and then add 25 to each subsequent number. For example: 25, 50, 75, 100, 125, and so on.
2. Why is counting in 25s useful?
Ans. Counting in 25s can be helpful for quickly calculating larger numbers or for practicing multiplication by 25.
3. Can counting in 25s be used in real-life scenarios?
Ans. Yes, counting in 25s can be useful when calculating time, money, or measurements in multiples of 25.
4. What are some tips for mastering counting in 25s?
Ans. Practice regularly, use visual aids like a number line, and try to find patterns in the numbers to make counting in 25s easier.
5. How can counting in 25s help with mental math skills?
Ans. Counting in 25s can improve mental math skills by strengthening multiplication abilities and helping with quick calculations.
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