Metamath Proof Explorer


Theorem 9t4e36

Description: 9 times 4 equals 36. (Contributed by Mario Carneiro, 19-Apr-2015)

Ref Expression
Assertion 9t4e36 94=36

Proof

Step Hyp Ref Expression
1 9nn0 90
2 3nn0 30
3 df-4 4=3+1
4 9t3e27 93=27
5 2nn0 20
6 7nn0 70
7 eqid 27=27
8 2p1e3 2+1=3
9 6nn0 60
10 1 nn0cni 9
11 6 nn0cni 7
12 9p7e16 9+7=16
13 10 11 12 addcomli 7+9=16
14 5 6 1 7 8 9 13 decaddci 27+9=36
15 1 2 3 4 14 4t3lem 94=36