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To solve the addition problem , we'll follow these steps:
Let's perform the addition:
Step 1: Align the numbers:
43
+ 51
------
Step 2: Add the units column: . Write 4 in the units place.
Add the tens column: . Write 9 in the tens place.
Thus, the sum of 43 and 51 is .
The correct answer is , which corresponds to choice 1.
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Vertical alignment ensures you're adding units to units and tens to tens. This keeps the place values correct and prevents mixing up digits from different positions.
Always start from the rightmost column (units place) and work your way left. Think of it like reading backwards - units first, then tens, then hundreds.
Yes! For , you can think: 40 + 50 = 90, then 3 + 1 = 4, so 90 + 4 = 94.
Check if your answer is reasonable: 43 is close to 40, 51 is close to 50, and 40 + 50 = 90. So your answer should be close to 90.
No worries! Double-check by adding the numbers in reverse order (51 + 43) or by using mental math to estimate if your answer is close to the right range.
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