1
45 + 30 = 75 4 + 3 = 75
412 + 300 = 712 2
43 - 30 = 13 4 - 3 = 13 539 - 300 = 239 3
413 + 30 = 443 1+3=4
4213 + 30 = 4243 4
463 - 30 = 433 6-3=3
4253 - 30 = 4223 5
27 x 10 = 270 46 x 100 = 4600 65 x 1000 = 65000 6
2 x 60 = 120 6 x 200 = 1200 5 x 1000 = 5000 7
20 x 60 = 1200 60 x 200 = 12000 50 x 1000 = 50000 8
43 x 2 =86 14 x 20 =280 9
20 10 = 2 2 1=1 300 10 = 30 10
200 100 = 2 2 1=1 3000 1000 = 3 11
20 2 = 10 2 1=1 246 2= 123 12
164 + 11 = 175 164 + (10+1) = 175
3216 + 11 = 13
16 + 9 = 25 16 + (+10-1) = 25
316 + 9 = 325 14
16 - 11 = 5 16 - -10-1) = 27 15
16 - 9 = 7 16 - (-10+1) = 27
316 - 9 = 307 16
23 + 36 =59 (2+3)=5
(3+6)=9 17
37 + 53 =90 (3+5)=8+1 (7+3)=10
18
16 + 21 = 27 16 + (20+1) = 27 19
16 + 31 = 47 16 + (30+1) = 47 20
16 + 41 = 57 16 + (40+1) = 57 21
16 + 19 = 35 16 + (20-1) = 35 22
16 + 29 = 45 16 + (30-1) = 45 23
16 + 39 = 55 16 + (40-1) = 55 24
56 - 21 = 35 56 - (20-1) = 35 366 - 21 = 345 25
56 - 31 = 25 56 - (30-1) = 25 366 - 31 = 335 26
56 - 19 = 37 56 - (20+1) = 37 366 - 19 = 347 27
856 + 101 = 957 856 +100 +1 = 957 28
856 + 201 = 1057 856 +200 +1 = 1057 29
856 + 301 = 1157 856 +300 +1 = 1157 30
246 - 99 = 147 246 - (100+1) = 147 31
646 - 199 = 447 646 - (-200+1) = 447 32
1446 - 299 = 1147 1446 - (-300+1) = 1147 33