Addition
Use expanded addition to add 327 + 241 =
300 + 200 = 500
20 + 40 = 60
7 + 1 = 8
568
534 - 108 =?
426
302 - 164 = ?
138
18 = 11 + n
n = 7
Use a picture to show
An aquarium has 25 guppies and 18 goldfish in it. How many fish live in the aquarium?
25 + 18 = 43 fish
730 + 168 =
898
Subtract using an expanded equation
374 - 232 = ?
300 - 200 = 100
70 - 30 = 40
4 - 2 = 2
142
402 - 139 = ?
263
13 + n = 25
n = 12
Draw a picture and solve
A total of 254 people entered a running race. So far 135 people have finished the race. How many people are still racing?
254 - 135 = 119 people
Use base 10 blocks to show 279 + 143 = ?
422
Subtract using an expanded equation
738 - 523
700 - 500 = 200
30 - 20 = 10
8 - 3 = 5
215
600 - 164 = ?
436
36 + 45 ____ 71
equal or not equal
not equal
New York has 14 grocery stores and Chicago has 18. How many grocery stores do they have altogether?
32 grocery stores
Estimate and find the sum of:
347 + 325 = ?
600, 672
Use place value blocks to solve
347 - 263 = ?
84
501 - 186 = ?
315
10 = 22 - n
n = 12
Max went to the store to buy 10 lemons, he also bought 4 limes. Julie went to the store and bought 25 lemons. Who bought more lemons and how many more did they buy?
Julie and 15 more lemons
64 + 42 + 88 = ?
194
347 - 162 = ?
185
1000 - 236 = ?
764
n = 624 - 311
n = 313
Jessica had 42 cows, she gave 28 to her friend Alvin. How many cows does she have left?
14 cows