Common Mistakes in Preschool Math
- AGrader Learning Centre
- Apr 2
- 4 min read
Kindergarten students are in the early stages of learning math concepts, and mistakes are a natural part of the learning process. Developing a strong understanding of numbers, number sense, and problem-solving skills will help children build a solid foundation for future mathematical success. In this article, we will discuss some common kindergarten math problems and mistakes children make and provide simple solutions to help them learn math more effectively.
Table of Contents
Subtracting a Greater Number from a Smaller Number
A common mistake children make in kindergarten math practice is subtracting a larger number from a smaller number without understanding the concept of subtraction correctly.
Example:
"Subtract 2 from 5" or "What is 2 less than 5?"
Common mistake: Children may write “2 - 5 = 3” because they see the number 2 first.
Solution: Always start from the greater number. Since 5 is greater than 2, we begin from 5.
Correct answer: 5 - 2 = 3
This method works with addition as well! When solving addition and subtraction problems, always begin with the larger number.
Misunderstanding Story Sums
Word problems can be tricky for young learners because they require both reading comprehension and mathematical reasoning. Children may not know if they need to add or subtract when solving story sums.
Example 1:
Mary has 4 marbles. She bought 3 more marbles. How many marbles does she have altogether?
Solution:
Identify the keyword: "altogether" – This means we need to add.
Use a number bond to visualise: 3 and 4 go into the parts, so to find the whole, we add.
3 + 4 = 7
Example 2:
Jess has 9 buns. She ate 3 buns. How many buns does she have left?
Solution:
Identify the keyword: "left" – This means we need to subtract.
Use a number bond: 9 is the whole, and 3 is the part that is taken away.
9 - 3 = 6
Multiplication Mistakes
Multiplication is an advanced topic in kindergarten math, and many children struggle with understanding multiplication sentences correctly. They often use multiplication sentences interchangeably, thinking that 2 × 3 = 6 is the same as 3 × 2 = 6.
Common misconception: 2 × 3 means two groups of three, whereas 3 × 2 means three groups of two.
Solution: To help children understand multiplication better:
Use hands-on activities like grouping objects.
Draw pictures to show different groups.
Emphasise writing multiplication sentences correctly based on the number of groups present.
For example, if there are 3 groups of 2 objects, the correct equation is 3 × 2 = 6.
Length: Reading a Ruler
Kindergarten students often misinterpret ruler measurements because they focus only on the number at the end of an object without considering the starting point.
Common mistake: A child sees that a paintbrush ends at 14cm and assumes its length is 14cm.
Solution:
Mark the starting and ending points.
Subtract the starting point from the ending point.
If the paintbrush starts at 3cm and ends at 14cm: 14 - 3 = 11
The correct length of the paintbrush is 11 cm.
Counting Money
Many kindergarten students struggle with counting money. Instead of counting on from the highest value coin, they may just read out each coin’s value separately.
Instead of counting 50, 70, 80, they may just name the coins as “50, 20, 10” without adding them up.
Building a strong foundation in kindergarten math skills is essential for future success. While mistakes are a normal part of learning, understanding common pitfalls and applying simple solutions can help kindergarten students develop confidence in their math abilities. By incorporating hands-on activities, visual aids, and clear explanations, we can support children as they learn math and strengthen their problem-solving skills. Encouraging a positive approach to math lessons for kindergarten will ensure children develop a love for numbers and mathematics as they progress in their education.
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