We have hundreds of course questions with personalized recommendations + Account 100% premium
To solve this problem, we can use the technique of breaking down numbers for easier mental addition.
Step 1: We start with the expression .
Step 2: We can decompose the number 8 into two numbers that are easier to add in parts. A simple break down is .
Step 3: We substitute the breakdown into the original expression:
Thus, the expression is equivalent to , giving us the correct answer.
Therefore, the correct equivalent expression is .
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Breaking 8 as 6 + 2 is strategic! Adding 54 + 6 gives us the friendly number 60, making it super easy to add the final 2. Other breakdowns like 5 + 3 don't create such convenient stepping stones.
Multiples of 10 like 60 are friendly because they're easy to work with mentally. When you reach 60, adding any single digit becomes simple - no carrying or complex thinking required!
You could, but it's usually more efficient to break down the smaller number. This keeps the math simpler and helps you reach friendly numbers faster.
Look for combinations that help you reach multiples of 10! Since 54 + 6 = 60, breaking 8 as 6 + 2 is perfect. Practice recognizing these patterns.
With practice, yes! This method reduces mental effort and errors. While 54 + 8 might seem direct, the decomposition strategy builds number sense and works great for larger, more complex problems.
Get unlimited access to all 18 Natural Numbers around 100 questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime