Double Digit Math Examples:
No Regrouping!
32 + 45 =
(30 + 2) + (40 + 5) =
2 + 5 = 7
30 + 40 = 70
70+7=77
57 – 32 =
(50+7) – (30+2) =
7-2=5
50-30=20
20+5=25
Double Digit Math Examples
with Regrouping:
57 + 26 =
(50 + 7) + (20 + 6) =
7 + 6 = 13
(10+3)
50 + 20 = 70
(take the 10 and add it to the tens of 70 + 10)
70+10=80
80+3=83
72 – 38 =
(70+2) – (30+8) =
2-8
(borrow 10 from 70 to make that 60
and make the 2 a 12)
12-8=4
60-30=30
30+4=34
No Regrouping!
32 + 45 =
(30 + 2) + (40 + 5) =
2 + 5 = 7
30 + 40 = 70
70+7=77
57 – 32 =
(50+7) – (30+2) =
7-2=5
50-30=20
20+5=25
Double Digit Math Examples
with Regrouping:
57 + 26 =
(50 + 7) + (20 + 6) =
7 + 6 = 13
(10+3)
50 + 20 = 70
(take the 10 and add it to the tens of 70 + 10)
70+10=80
80+3=83
72 – 38 =
(70+2) – (30+8) =
2-8
(borrow 10 from 70 to make that 60
and make the 2 a 12)
12-8=4
60-30=30
30+4=34