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Adding Two Numbers Directly
.Another term for directly is “no synthesis.” When adding directly all the beads you need are available to push to the separation bar.
From http://www.uabacus.arizona.edu/ Developed by Dr. L. Penny Rosenblum
3+1 = 4
Set three 1-beads in the units column.Ask: “Can I add 1 directly?”Answer” “Yes I can.”Set a 1-bead in the units column.You now have 4 beads in the unit column.Sum = 4
From http://www.uabacus.arizona.edu/ Developed by Dr. L. Penny Rosenblum
5+3 = 8
Set a 5-bead in the units column.Ask: “Can I add 3 directly?”Answer” “Yes I can.”Set three 1-beads in the units column.You now have 8 beads in the units column.Sum = 8
From http://www.uabacus.arizona.edu/ Developed by Dr. L. Penny Rosenblum
Set two 1-beads in the units column.Ask: “Can I add 2 directly?”Answer” “Yes I can.”Set two 1-beads in the units column.You now have 4 beads in the units column.Sum = 4
2+2 = 4
From http://www.uabacus.arizona.edu/Developed by Dr. L. Penny Rosenblum
Try doing 6 + 3 on your own. Say the steps!
From http://www.uabacus.arizona.edu/Developed by Dr. L. Penny Rosenblum
6 + 3 = 9
Set a 5-bead and a 1-bead in the units column.Ask: “Can I add 3 directly?”Answer” “Yes I can.”Set three 1-beads in the units column.You now have 9 beads in the units column.Sum = 9
From http://www.uabacus.arizona.edu/Developed by Dr. L. Penny Rosenblum
30 + 50 = 80
Set three 1-beads in the tens column.Ask: “Can I add 50 directly?”Answer” “Yes I can.”Set a 5-bead in the tens column.You now have 8 beads in the tens column.Sum = 80From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum
Try doing 60 + 10 on your own. Say the steps!
From http://www.uabacus.arizona.edu/Developed by Dr. L. Penny Rosenblum
60 + 10 = 70
Set a 5-bead and a 1-bead in the tens column.Ask: “Can I add 10 directly?”Answer” “Yes I can.”Set a 1-bead in the tens column.You now have 7 beads in the tens column.Sum = 70From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum
45 + 3 = 48
Set four 1-beads in the tens column and a 5-bead in the units column.Ask: “Can I add 3 directly?”Answer” “Yes I can.”Set three 1-beads in the units column.Sum = 48
From http://www.uabacus.arizona.edu/ Developed by Dr. L. Penny Rosenblum
27 + 60 = 87
Set two 1-beads in the tens column and 7 beads in the units column.Ask: “Can I add 60 directly?”Answer” “Yes I can.”Set a 5-bead and a 1-bead in the tens column.Sum = 87From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum
55 + 20 = 75
Set a 5-bead in the tens column and a 5-bead in the units column.Ask: “Can I add 20 directly?”Answer” “Yes I can.”Set two 1-beads in the tens column.Sum = 75
From http://www.uabacus.arizona.edu/Developed by Dr. L. Penny Rosenblum
13 + 26 = 39
Set a 1-bead in the tens column and three 1-beads in the units column.Ask: “Can I add 20 directly?”Answer” “Yes I can.”Set two 1-beads in the ten column.Ask “Can I add 6 directly?”Answer” “Yes I can.”Set a 5-bead and a 1-bead in the units column.Sum = 39From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum
46 + 52 = 98
Set four 1-beads in the tens column and 6 beads in the units column.Ask: “Can I add 50 directly?”Answer” “Yes I can.”Set a 5-bead in the tens column.Ask “Can I add 2 directly?”Answer” “Yes I can.”Set two 1-beads in the units column.Sum = 98From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum
247 + 601 = 848
Set two 1-beads in the hundreds column, four 1-beads in the tens column and 7 beads in the units column.Ask: “Can I add 600 directly?” Answer” “Yes I can.” Set 600 in the hundred columns.Ask: “Can I add 0 directly?” Answer” “Yes I can.” Set 0 by tapping the silver bar in the tens column.Ask: “Can I add 1 directly?” Answer” “Yes I can.” Set 1 in the units column.Sum = 848
From http://www.uabacus.arizona.edu/ Developed by Dr. L. Penny Rosenblum
567 +321 = 888
Set a 5-bead in the hundreds column, 6 beads in the tens column and 7 beads in the units column.Ask: “Can I add 300 directly?” Answer” “Yes I can.” Set 300 in the hundred columns.Ask: “Can I add 20 directly?” Answer” “Yes I can.” Set 20 in the tens column.Ask: “Can I add 1 directly?” Answer” “Yes I can.” Set 1 in the units column.Sum = 888From http://www.uabacus.arizona.edu/
Developed by Dr. L. Penny Rosenblum