Unit
2.1
Adding up to 6-Digit Numbers
a) 4 + 2 =
6
e) 5 + 20 + 100 =
125
b) 6 + 10 =
16
f) 200 + 150 =
350
c) 11 + 2 + 3 =
16
g) 3 + 2 + 55 =
60
d) 12 + 15 + 2 =
29
h) 900 + 100 =
1000
Addition Without Regrouping
Add.
A-
270
+11
281
B-
452
+425
877
C-
9211
+678
9889
D-
325
+14
339
E-
433
+244
677
F-
2688
+111
2799
G-
683
+110
793
H-
384
+614
998
14
Addition With Regrouping Ones
1
- Find the sum without using a calculator.
a-
1
253
+19
272
b-
1
136
+48
184
c-
1
154
+16
170
d-
1
658
+22
680
Remember, to find:
68 + 15 =
68
+ 15
⟶
60 +
8
⟶
10 +
5
⟶
1
68
+ 15
3
⟶
68
+ 15
83
13
13 is 1 ten
and 3 ones
so we add a
ten to the
tens place
Addition With Regrouping Tens and Ones
463
+58
⟶
Remember, to find:
3 + 8 = 11
1
463
+58
1
⟶
Add the digits in the
tens column together
1
463
+58
21
⟶
Add the digits in the
hundreds column
together
463
+58
521
15
Exercises
1
-Find the sum
a-
11
366
+295
661
b-
11
483
+129
612
c-
11
3454
+1367
4821
d-
11
2299
+345
2644
e-
232359
+520640
752999
f-
11
3298
+212
3510
2
-Fill in the blank with the suitable digit, and check your answer using
a calculator.
a calculator.
a-
410023 +
3
15
9
5
2 = 725975
b-
6
0880 + 3
6
9
5
7 = 97837
Use the calculator to check all exercises in the lesson.