Addition - UKG Math Worksheets - Free Printable

Let’s solve this step by step.

We have a grid with some numbers and operations. The orange squares are missing — we need to fill them in so that all the rows and columns make correct math equations.

Here’s the grid again for reference (with positions labeled):

Row 1:
5 + 6 = [Orange Square A]

Row 2:
+ [Green] - [Green] +

Row 3:
[Orange Square B] - 3 = 7

Row 4:
= [Green] = [Green] =

Row 5:
15 + [Orange Square C] = 18

Also, notice that the green squares are not to be filled — they’re just part of the structure. We only care about the orange ones.

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First, let’s solve Row 1:

5 + 6 = ?

That’s easy: 5 + 6 = 11

So Orange Square A = 11

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Now look at Row 3:

? - 3 = 7

To find the missing number, add 3 to both sides:

? = 7 + 3 = 10

So Orange Square B = 10

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Now look at Row 5:

15 + ? = 18

Subtract 15 from both sides:

? = 18 - 15 = 3

So Orange Square C = 3

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Wait — but we should also check if these values work vertically, because the grid is connected!

Let’s check the columns.

Column 1:

Row 1: 5
Row 2: +
Row 3: 10 (we just found)
Row 4: =
Row 5: 15

So it says: 5 + 10 = 15 → That’s TRUE! ✔

Column 3:

Row 1: 6
Row 2: -
Row 3: 3
Row 4: =
Row 5: 3 (we just found)

So: 6 - 3 = 3 → That’s TRUE! ✔

Column 5:

Row 1: 11 (from 5+6)
Row 2: +
Row 3: 7
Row 4: =
Row 5: 18

So: 11 + 7 = 18 → That’s TRUE! ✔

Perfect! All the vertical equations also work with our answers.

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Final Answer:
The numbers to fill in the orange squares are:
Top right: 11
Middle left: 10
Bottom middle: 3