Mental addition
Add 24 + 31 mentally
55
130 + 20
150
1,344 + 112 =
1,456
5,823 + 454
6,277
3,184 people visited a park on Wednesday. 2,146 people visited the park on Thursday. How many people visited the park on both days?
5,330 people
Add 70 + 40 mentally
110
70 + 50
120
2,410 + 1,023
3,233
6,512 + 2,745
9,257
Ms. Carter saves $2,318. She saves $460 less than Ms. Jones. How much do they save in all?
$4,176
Add 36 + 43 mentally
79
550 + 40
590
5,362 + 506
5,868
3,253 + 4,804
8,057
A factory made 1,853 toys on Monday. 48 more toys were made on Monday than on Tuesday. How many toy cars were made in the two days?
3,754 toys
Add 125 + 120 mentally
145
4,020 + 40
4,060
7,462 + 2,537
9,999
14,266 + 1,769
16,035
There are 3,689 trees in a park. There are 194 more bushes than trees in the park. How many bushes and trees are there in all?
7,572 bushes and trees
Add 140 + 23 mentally
163
19,020 + 80
20,000
22,516 + 10,423
32,939
37,146 + 12,975
50,121
John jumped 236 times in the first round of a competition. He jumped 75 more times in the second round than the first round. He said that the number of jumps for the second round was 301.
Is John correct? Explain.
No, he is not correct. 236 + 75 = 311. John forgot to regroup the tens place