Number (4 ops and mixed)
Hong Kong
Stage 1
Checking reasonableness of calculations
Interactive practice questions
Is $4000$4000 a reasonable estimate for $42\times8$42×8?
Yes
A
No
B
Easy
< 1min
Is $400$400 a reasonable estimate for $2002\div5$2002÷5?
Easy
< 1min
Irene had $120$120 dolls and she gave $18$18 to her friend Charlie. Charlie said that Irene had $138$138 dolls left. Is Charlie's statement reasonable?
Easy
< 1min
Maximilian thinks $3.5$3.5 kg of apples will cost about $\$7.25$$7.25. Is this a reasonable estimate?
Easy
< 1min
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