Here are the solutions for the worksheet.
Section A: Complete the calculations
1) 500 + 30 + 2
* Think of it as place value: 5 hundreds, 3 tens, and 2 ones.
* Put them together:
532
2) 100 + 90 + 7
* 1 hundred, 9 tens, and 7 ones.
* Put them together:
197
3) 5 + 500 + 60
* Rearrange to make it easier: 500 (hundreds) + 60 (tens) + 5 (ones).
* Put them together:
565
4) two hundred + thirty + one
* Write the numbers as digits: 200 + 30 + 1.
* Put them together:
231
5) 80 + 200 + 4
* Rearrange to put the biggest number first: 200 + 80 + 4.
* Put them together:
284
6) 4 + 20 + [ ] = 124
* First, add what you know: 20 + 4 = 24.
* Ask yourself: What do I add to 24 to get 124?
* The difference is 100.
* Answer:
100
7) 70 + [ ] + 4 = 674
* First, add the small numbers you see: 70 + 4 = 74.
* Ask yourself: What do I add to 74 to get 674?
* The missing part is the hundreds. 600 + 74 = 674.
* Answer:
600
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Section B: Complete the part whole models
In these diagrams, the top circle is the "Whole" (the total), and the bottom circles are the "Parts" that add up to make the whole.
1)
* Parts: 100 and 4.
* Add them: $100 + 4 = 104$.
* Top Circle:
104
2)
* Parts: 700, 20, and 2.
* Add them: $700 + 20 + 2 = 722$.
* Top Circle:
722
3)
* Whole: 370. One Part: 300.
* Subtract the part from the whole: $370 - 300 = 70$.
* Missing Part:
70
4)
* Whole: 699. One Part: 9.
* We need to split the remaining amount (690) into two logical parts, usually hundreds and tens.
* $699 - 9 = 690$.
* Split 690 into
600 and
90.
* Missing Parts:
600 and
90 (order doesn't matter for the empty circles).
5)
* Whole: 107. One Part: 100.
* Subtract the part from the whole: $107 - 100 = 7$.
* Missing Part:
7
6)
* Whole: 266. Middle Part: 60.
* We need to split the remaining amount into hundreds and ones.
* Look at the number 266. It has 2 hundreds, 6 tens, and 6 ones.
* The middle part is the tens (60).
* The left part is usually the hundreds:
200.
* The right part is usually the ones:
6.
* Check: $200 + 60 + 6 = 266$.
* Missing Parts:
200 and
6.
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Final Answer:
Section A
1) 532
2) 197
3) 565
4) 231
5) 284
6) 100
7) 600
Section B
1) Top: 104
2) Top: 722
3) Right: 70
4) Left: 600, Middle: 90 (or vice versa)
5) Right: 7
6) Left: 200, Right: 6
Parent Tip: Review the logic above to help your child master the concept of year three maths worksheet.
