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To find the sum of 52 and 9, we'll perform simple addition:
Step 1: Consider the expression .
Step 2: Break down the number 9 into simpler parts. One natural way is .
Step 3: Now express the addition as .
Step 4: Compute the sum: First add , and then .
Step 5: The expression matching is .
Now, looking at the available choices, the choice that matches is
Therefore, the correct representation of the expression is
If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?
Breaking 9 as 8 + 1 is strategic! Adding 8 to 52 gives us a nice round number (60), making the final step easier. You could use 7 + 2 or 6 + 3, but 8 + 1 creates the simplest path.
No! Only 52 + 8 + 1 equals 61. The other choices like 33 + 8 + 2 = 43 give completely different sums. The question asks which expression represents 52 + 9, not which equals 61.
Yes! You could write 52 + 9 as (50 + 2) + 9 or other combinations. However, the answer choices specifically show 52 staying together, so focus on decomposing the 9.
Check that your broken parts add up to the original number. For 9: does 8 + 1 = 9? ✓ Does 6 + 3 = 9? ✓ But we need the one that matches 52 + 9 exactly!
Very close! This uses the associative property: 52 + 9 = 52 + (8 + 1) = (52 + 8) + 1. We're regrouping the addition to make calculation easier.
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