Two rods, five rows, and carries that have to happen the moment they occur — the width where abacus method starts beating pencil and paper.
5 rows × 2 digits, addition
About 7 min
Free, no account
Sample problems
Real problems from this drill, with answers. Nothing to install, no account, no email — work them on paper, on a physical abacus, or in your head.
1
89
+ 95
+ 11
+ 22
+ 62
?
2
89
+ 82
+ 85
+ 16
+ 19
?
3
33
+ 77
+ 73
+ 98
+ 37
?
4
54
+ 42
+ 59
+ 12
+ 76
?
5
46
+ 32
+ 56
+ 18
+ 51
?
6
54
+ 28
+ 62
+ 17
+ 40
?
7
33
+ 58
+ 27
+ 32
+ 25
?
8
96
+ 12
+ 30
+ 60
+ 63
?
9
55
+ 16
+ 54
+ 93
+ 62
?
10
37
+ 80
+ 12
+ 95
+ 69
?
Full answer key
89 + 95 + 11 + 22 + 62 = 279
89 + 82 + 85 + 16 + 19 = 291
33 + 77 + 73 + 98 + 37 = 318
54 + 42 + 59 + 12 + 76 = 243
46 + 32 + 56 + 18 + 51 = 203
54 + 28 + 62 + 17 + 40 = 201
33 + 58 + 27 + 32 + 25 = 175
96 + 12 + 30 + 60 + 63 = 261
55 + 16 + 54 + 93 + 62 = 280
37 + 80 + 12 + 95 + 69 = 293
Practise it now
The same drill, live in your browser, with a virtual soroban and instant marking.
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About this drill
Two-digit columns are the first width where the written algorithm and the abacus genuinely diverge. On paper you add all the units, write a carry, then add all the tens. On the abacus the carry happens the instant it is created, so there is never a pending digit anywhere — which is exactly why the procedure survives being moved into the head later.
The drills below hold every running total under 500, so two rods are always enough and no problem needs a third. That constraint keeps the exercise about the carry itself rather than about managing a wider workspace.
How to practise it
1Set the first number on the two rightmost rods.
2Add each row units-first, then tens — never the other way round.
3Resolve every carry immediately; do not defer it to the end.
4Read both rods together as one number when you finish.
Questions
Why units before tens?
Because a units carry changes the tens rod. Going the other way means revisiting a rod you already set, which is the habit that breaks mental work later.
Do I need a real abacus?
No. The interactive drill on this page runs a full virtual soroban in the browser, and every sample below is solvable with pencil and paper too.
Is this the same as "2 digit abacus practice"?
Yes — two-digit here means each number in the column has two digits, so the work happens across two rods.
My child is accurate but slow.
That is the correct order. Speed comes from removing hesitation, not from hurrying; keep accuracy at 100% and let the pace rise on its own.