Stand-Up Addition
2+1=
3
4+1=
5
Draw 4 ones and add 1. Then count them to find the total.
1+9
Round 9.
1+10=11
2+3=
5
6+3=
9
6+5=
11
Draw 6 ones and add 5. Then count them to find the total.
5+8
Round 8.
5+10=15
7+2
Round 2.
7+0=7
10+3=
13
13+3=
16
Draw 13 ones and add 3. Then count them to find the total.
12+14
Round both numbers.
10+10=20
13+5=
You have 13 ones. Add 5 ones. 18 is your answer.
14+9=
23
15+7=
22
Draw 15 ones and add 7. Then count them to find the total.
Round both numbers.
20+10=30
20+13
33
17+14=
31
20+13=
33
Draw 20 ones and add 13. Then count them to find the total.
27+14
Round both numbers.
30+10=40
35+12=
47