Adding with the Algorithm
Add: 243 + 516
Show your work!
759
Add Mentally: 38 +20
Only your answer is on your board!
58
34 + __ = 50
34 + 16 = 50
Find the missing number
4_
+ 23
72
49
Add: 352 +426
Show your work!
778
Add Mentally: 49 +26
Only your answer is on your board!
75
__ + 27 =65
38 + 27 =65
I add a two-digit number to the number made by reversing its digits. The answer is 121. What could my number be?
56 + 65 = 121 or 47 + 74 = 121
Add: 247 + 135
Show your work!
382
Add Mentally: 125 + 48
Only your answer is on your board!
173
145 + ___= 200
145 + 55 = 200
Which gives the answer 234?
187 + 123
68 + 166
205 + 84
68 + 166 = 234
Add: 268 + 157
Show your work!
425
Add Mentally: 386+57
Only your answer is on your board!
443
785 + ___ = 1,200
785 + 257 = 1,200
I add a number to itself and get 450. What number did I start with?
225!
Add: 687 + 578
Show your work!
1265
Add Mentally: 888 + 125
Only your answer is on your board!
1013
___ + 145 + 268 = 670
257 + 145 + 268 = 670
Three treasure chests hold 1,500 gold coins altogether. The first chest has 100 more coins than the second chest. The third chest has 100 more coins than the first chest. How many coins are in each chest?
Chest 1: 500 coins
Chest 2: 400 coins
Chest 3: 600 coins