Mental Math
+ - = ???
100
To subtract 115 – 88 using mental math, Heath subtracted 115 – 90 and got 25. What should he do next?
- A. Subtract 2
- B. Subtract 8
- C. Add 2
- D. Add 8
Subtract 2
100
Priscilla had $2,000 in a savings account. She withdrew $143 to buy a new bicycle. How much money is left in the savings account?
$1,857
200
To subtract 143 – 75 using mental math, Lisa subtracted 143 – 80 and got 63. What should he do next?
- A. Add 5.
- B. Subtract 8.
- C. Subtract 3.
- D. Add 6.
A) Add 5
200
Nery estimated 4,954 + 3,065 by rounding each number to the nearest thousand. What 2 numbers did he add?
5,000 + 3,000
300
Nina wants to save $500 this year. So far, she has saved $236. Which picture models how to find how much more money she must save to reach her goal?
A.
B.
C.
D.
B
300
Suppose Hector plays a seventh game and scores 3,201 more points than he did in Game 2.
Find Hector's score for Game 7.
16,740 points
400
Devin caught 18 pokemon on Monday. He caught a total of 40 pokemon on Monday and Tuesday. Which picture models how to find the number of pokemon he caught on Tuesday?
A.
B.
C.
D.
B
400
People came to California in the gold rush in 1849. The first man landed on the moon in 1969. How many years had passed since the beginning gold rush to landing on the moon?
120 years