This work is for israel that he made himself he is not allowed to use and calculator.
Addition
1000x1=1000
1000x2=2000
1000x3=3000
1000x4=4000
1000x5=5000
1000x6=6000
1000x7=7000
1000x8=8000
1000x9=9000
Subtraction
900-100=800
900-200=700
900-300=600
900-400=500
900-500=400
900-600=300
900-700=200
900-800=100
900-900=0
2sx tables
10x2=20
20x2=40
30x2=60
40x2=80
50x2=10
60x2=120
70x2=140
80x2=160
90x2=180
100x2=200
200x2=400
300x2=600
400x2=800
500x2=1000
Some more 2s
2x5=10
2x6=12
2x7=14
2x8=16
2x9=18
2x10=20
2x11=22
2x12=24
2x13=26
2x14=28
2x15=30
2x16=32
2x17=34
2x18=36
2x19=38
2x20=40
Some more 2s
2x21=42
2x22=44
2x23=46
2x24=48
2x25=50
2x26=52
2x27=54
2x28=56
2x29=58
2x30=60
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