Keep the total so far on the frame, and add the next number on top.
Adding a column is just adding one number at a time.
Keep the total so far on the frame, and add the next number on top. The frame remembers it for you.
Hunt for friendly pairs first: two numbers that make ten, like 6 and 4 or 8 and 2, are easy.
Written down or on the frame, a carry works the same way.
These are some of the questions on the sets. The printable sheets have more, with the bead frame drawn for each, and an answer key.
80. 35 + 28 = 63, and 63 + 17 = 80.
91. 46 + 27 = 73, and 73 + 18 = 91.
67. Tens: 2 + 3 + 1 = 6. Ones: 4 + 1 + 2 = 7. No carries.
4. 6 + 4 = 10.
Ask a grown-up for three or four prices from a shop leaflet. Add the first two, say the total so far, then add the next one on top. Then add them again in a different order and see if the total is the same.
Take three or four prices from a shop leaflet. Add them in one order, then again in a different order, and see that the total is the same.
