Let’s solve this step by step.
We are looking at a multiplication table from 1 to 10. The green squares along the diagonal (from top-left to bottom-right) show what happens when you multiply a number by itself — these are called “square numbers.”
Let’s list them out:
- 1 × 1 =
1
- 2 × 2 =
4
- 3 × 3 =
9
- 4 × 4 =
16
- 5 × 5 =
25
- 6 × 6 =
36
- 7 × 7 =
49
- 8 × 8 =
64
- 9 × 9 =
81
- 10 × 10 =
100
Now, let’s add all these square numbers together:
Start adding step by step:
1 + 4 =
5
5 + 9 =
14
14 + 16 =
30
30 + 25 =
55
55 + 36 =
91
91 + 49 =
140
140 + 64 =
204
204 + 81 =
285
285 + 100 =
385
Double-checking the addition:
Group them to make it easier:
(1 + 100) = 101
(4 + 81) = 85
(9 + 64) = 73
(16 + 49) = 65
(25 + 36) = 61
Now add those:
101 + 85 = 186
186 + 73 = 259
259 + 65 = 324
324 + 61 =
385
Same result! So we’re confident.
Final Answer:
385
Parent Tip: Review the logic above to help your child master the concept of math fact worksheet times tables.
