Hold one number, not seven.

Add each number into your total the instant it appears, then let it go. If you try to store the numbers and sum at the end, you’ll cap out at four or five items; a single running total scales to any length. The only thing in your head between flashes should be one number.

Add left-to-right in two beats: tens, then ones. 47 + 26 is “67… 73.” With practice the tens-add happens while the number is still on screen, and the ones-add fills the gap before the next flash. Round-and-correct also works: +29 is “+30, −1.”

Saying “forty-seven plus twenty-six” in your inner voice is the bottleneck — speech is slower than the 0.6-second flashes at top tier. Train yourself to see 47 and feel the quantity, the way you read a word without spelling it. Anzan masters visualize abacus beads; you just need the total as a shape, not a sentence.

If a flash catches you mid-add, don’t rewind — there is no rewind. Either fold the new number into your best current total and accept a possible small error, or consciously write the sequence off and rest for the next one. A fast confident answer is sometimes wrong; a reconstructed one almost always is.

Tier 1 is three slow single digits — pure warm-up, bank them. From tier 3 the numbers get two digits and the flash time drops, so switch fully to tens-first chunking before you’re forced to. Knowing the answer’s rough size (7 numbers up to 50 → a total around 150–250) also catches typos before you submit.