Well, 25 twos is equal to 50. So 10 fives are equal equal to 25 twos.
6 fives
15 twos are 30 and 30 divided by 5 is 6 so the answer is 6
2
2
30
11 - 9p.
no it strikes twos, threes fours and fives and sixes, but it is scared of 7, 8, and 9. because seven ate nine
15 x 2 = 3030 = 5 x 6
8 (sum means add 2x10 +10x2 =40 then divide by 5 to find the amount of fives that fit=8)
An abacus. The roman abacus worked on the same principle as the Japanese abacus, but looked very different. The Japanese one had a number of beads strung on wires, grouped in twos and fives. The roman one was a small slab of stone, with small round depressions cut into the surface. These were arranged in straight lines and grouped in twos and fives. The Romans put pebbles into the depressions, and manipulated them in just the same way as the Japanese did their beads, though rather more slowly. If you know roman numerals, you will know that they are grouped in twos and fives. Incidentally, the latin word for pebble is calculus. So, the word calculate . . .