Estimation
Round 41 to the closest 10s
40
What is 450 + 111?
450
+ 111
_______
561
Write 3 related facts for 4 + 3 = 7
3 + 4 = 7 | 7 - 4 = 3 | 7 - 3 = 4
Use mental math to solve 45 - 18
45 - 18 =
+2 +2
47 - 20 = 27
Ms. D has 25 v-bucks. Ms. Jassal gave her 30 more. How many v-bucks does Ms. D have altogether?
25 + 30 = 55
Ms. D has 55 v-bucks altogether.
Changing the numbers to the closest 10s what is 75 - 44?
80 - 40 = 40
What is 787 + 234? Use regrouping!
787
+ 234
_______
1021
Write 3 related facts for 12 - 8 = 4
12 - 4 = 8 | 8 + 4 = 12 | 4 + 8 = 12
Use mental math to solve 56 + 41
56 + 41 =
+1 -1
57 + 40 = 97
Kuromi has 300 crayons. Cinnamoroll borrowed 245 of them. How many crayons does Kuromi have left?
300 - 245 = 55
Kuromi has 55 crayons left.
Using front-end estimation what is 67 - 23?
60 - 20 = 40
What is 956 - 342?
954
- 342
______
612
What is a related fact for 7 + 7 = 14?
14 - 7 = 7
Use mental math to solve 33 + 44
33 + 44 =
-3 +3
30 + 47 = 77
Ms. D was playing dress to impress and she put 154 layers on. Her partner was wearing 270 layers. How many layers were they wearing altogether?
154 + 276 = 430
They have 430 layers altogether.
Changing one number, estimate 87 - 13? (There are 2 answers)
90 - 13 = 77 OR 87 - 10 = 77
What is 500 - 123? Use regrouping!
500
- 123
______
377
What is a related fact for 18 - 9 = 9?
9 + 9 = 18
Use mental math to solve 95 - 78
95 - 78 =
-2 +2
93 - 80 = 13
Ms. D was playing a large game of Fortnite with 345 players. But 184 of them were NPC's. How many more players were real?
345 - 184 = 161
There were 161 real players.
Estimate 234 to the closest 10
230
Write 4 related facts using 8, 11, and 3
8 + 3 = 11 | 3 + 8 = 11 | 11 - 3 = 8 | 11 - 8 = 3
If a word problem is asking to find the sum, will you use addition or subtraction? (You must write the word)
Addition